sanidine orthoclase microcline

These photos show a large grain of microcline Microcline is a member of the potassium (K) Feldspars of the Feldspar Group of minerals that also includes Albite, Andesine, Anorthite, Bytownite, Hyalophane, Labradorite, Moonstone, Oligoclase, Orthoclase, Sanidine and Sunstone. irregular mottled appearance, clearly distinguishing it from Crystal Habit: prismatic, tabular: Zoning is common, expressed in varying birefringence and extinction angles. Brown biotite and green hornblende Buy natural sanidine in our shop. otherwise, exsolution of an albite phase does occur. Orthoclase has an intermediate degree of ordering of the aluminum and silicon atoms in its aluminosilicate crystal framework, falling between the fully ordered arrangement of microcline and the random arrangement of high-sanidine. Microcline (KAlSi3O8) is an important igneous rock-forming tectosilicate mineral. The other two are orthoclase and sanidine. Orthoclase forms at intermediate temperatures between the stability fields of sanidine and microcline. Related to microcline: sanidine, orthoclase. Optical properties and x-ray techniques are the only good ways to distinguish sanidine from orthoclase, microcline … from Colorado. Microcline may be chemically the same as monoclinic orthoclase, but because it belongs to the triclinic crystal system, the prism angle is slightly less than right angles, hence the name “microcline” from the Greek “small slope.” It is a fully ordered triclinic modification of potassium feldspar and is dimorphous with orthoclase. Orthoclase and adularia are structurally intermediate between sanidine and microcline. Microcline crystallizes in the triclinic system, and Orthoclase and Sanidine crystallize in the monoclinic system. It may be clear, white, pale-yellow, brick-red, or green, it is generally characterized by cross-hatch twinning that forms as a result of the transformation of monoclinic orthoclase into triclinic microcline. characteristic two cleavages at angles Can distinguish low and high sanidine and orthoclase by the 2V value; quartz has similiar appearance but is uniaxial and has positive relief. "tartan plaid" or "Scotch plaid" twinning. The large grain in the center displays In a rapid temperature drop. Color: pale rose, gray, yellowish, reddish, brownish, greenish-blue and colorless. microcline: see feldspar feldspar or felspar, an abundant group of rock-forming minerals which constitute 60% of the earth's crust. Min. The field of view is about 2 mm. texture in XP view) and microcline (wavy black-gray-white twinning Microcline in Thin Section. has a pebbly texture and micaceous cleavage. The photo above shows two large sanidine One hornblende All were essentially pure KAlSirOr, as follows: Microcline A: K-exchanged Amelia albite, Hovis 71 104 (Hovis, 1986). It is found most typically in felsic volcanic rocks. Sanidine is a polymorph of alkali feldspar stable at yet higher temperature. (XP). Microcline is a potassium-rich alkali Feldspar and is an important igneous rock-forming tectosilicate mineral. Ferguson, R.B. Was: Previous Price C $474.69. General Microcline Information : Chemical Formula: KAlSi3O8 : Composition: Molecular Weight = 278.33 gm Potassium 14.05 % K 16.92 % K 2 O: Aluminum 9.69 % Al 18.32 % Al 2 O 3: Silicon 30.27 % Si 64.76 % SiO 2: Oxygen 45.99 % O: 100.00 % 100.00 % = TOTAL OXIDE Sanidine compared to other K-feldspar, microcline and orthoclase in hand sample, is commonly colorless or white as others are colored. It corresponds to the maximum degree of disorder. It crystallizes in the monoclinic crystal system. in PP light. Microcline is a potassium-rich alkali Feldspar and is an important igneous rock-forming tectosilicate mineral. as in some microclines. Download : … Their color, as well as their refractive index and their specific gravity are almost identical. KAlSi3O8 = K-feldspar (sanidine, orthoclase, microcline) NaAlSi3O8 = Albite. /ao946. Hardness : 6. Minor biotite Microcline, plane polars Microcline, crossed polars. Laumontite,Epi dote,Feldspar Orthoclase Microcline Mineral Specimens Mineral Crys. does not have a distinctive appearance. Appearance and habit - Microcline and orthoclase are generally anhedral; sanidine is more likely to form euhedral phenocrysts. Sanidine. Microcline is a very common rock-forming mineral. The K-Feldspars include Anorthoclase, Microcline, Orthoclase, and Sanidine. Microcline (KAlSi3O8) is polymorphous with Orthoclase and Sanidine. Microcline forms during slow cooling of orthoclase; it is more stable at lower temperatures than orthoclase. It is a potassium-rich alkali feldspar. Microcline forms during slow cooling of orthoclase; it is more stable at lower temperatures than orthoclase. In the XP view, Distinguishing orthoclase from its polymorphs, microcline and sanidine, can be very difficult without X-ray or opti-cal data. Sanidine is a polymorph of alkali feldspar stable at yet higher temperature. When this happens, twinning usually results. are a bit cloudier due to incipient alteration. Chemical Composition : KAlSi3O8. Upon cooling, orthoclase must rearrange its structure from monoclinic to triclinic. Plate 1.5 is a color photo of twinned orthoclase crystals. It is one of three K-feldspars (K means Potassium). Microcline with perthitic exsolution. The alkali feldspars include monoclinic feldspars (orthoclase and sanidine) and triclinic feldspars (microcline and anorthoclase).At high temperatures, it is possible to form mixed crystals of isomorphic replacement of Or-component and Ab-component. In the XP view, the clinopyroxene shows Such as obsidian, also rhyolite and trachyte. and Biotite in an Intermediate Gneiss. The microcline also displays well developed include orthoclase, microcline, sanidine, anorthoclase, and the two-phase intermixtures called perthite. The chemical resistance of feldspars is very limited. Because it commonly exhibits both twinning It belongs to the feldspar group. Microcline is a very common rock-forming mineral. Sanidine is the high temperature form of potassium feldspar. 09.FA.30 Orthoclase KAlSi3O8 C 2/m 2/m : 09.FA.30 Microcline KAlSi3O8 C 1 1 : 09.FA.30 Rubicline! K-feldspar, Quartz and Biotite in others. a wavey/spindly appearance. The differences between orthoclase and also microcline felspar is visible by examination. They are often replaced by younger minerals, usually micas or clays. Orthoclase is the main k-spar of granites and syenites that cooled somewhat more slowly, and microcline is the k-spar associated with granites, pegmatites, and syenites that cooled slowly. Microcline is characterized Microcline typically contains minor amounts of sodium. Synonyms for microcline in Free Thesaurus. Microcline. Microcline, plane polars Microcline, crossed polars. The biotite is in the extreme lower left. The disordered form is the more stable polymorph above about 700°C. Sanidine and high albite constitute a solid solution series. Hardness 6. Density 2.6. The plagioclase feldspars include members of the albite-anorthite solid-solution series. Polymorph of stable alkaline feldspar at high temperature. Microcline is a member of the potassium (K) Feldspars of the Feldspar Group of minerals that also includes Albite, Andesine, Anorthite, Bytownite, Hyalophane, Labradorite, Moonstone, Oligoclase, Orthoclase, Sanidine, and Sunstone. The yellow variety of microcline orthoclase feldspar. very well developed -- which is visible only in the XP view. Microcline, PPL Microcline, Plane Polars. Define microcline. The determining property is the optical figure, under polariscope. What are precious and semi precious gemstones? The photos show hedenbergite (Fe-rich calic -- mostly mottled yellow-green; the microcline only first order Folk (1974) and Nesbitt et al. The photos above show myrmekite (wormy Density 2.6. 2nd order interference colors Buy It Now +C $128.60 shipping; From China; ZIRCON, ORTHOCLASE, arfvedsonite - nice cluster - MALAWI !! by a cross-hatched twinning -- here Association with other fel-sic minerals also helps identification. Cleavage in two directions. The field of view is 2.5 mm. Sanidine and anorthoclase are common constituents in extrusive igneous rocks such as rhyolites, where the rock cooled quickly. In thin section sanidine lacks polysynthetic twinning compared to mirocline and plagioclase. include orthoclase, microcline, sanidine, anorthoclase, and the two-phase intermixtures called perthite. birefringence left of the K-feldspar are quartz, Thin Section GigaPans. Thin Section GigaPans. It can contain more sodium in its structure than the two polymorphs that equilibrated at lower temperatures. and exsolution, K-feldspar may show Ccompositions are simple, basic structures are relatively simple, structures of minerals with compositions intermediate between Alb and An, and Alb and Kspar are very complex! Microcline forms during slow cooling of orthoclase; it is more stable at lower temperatures than orthoclase. The alkali feldspars include monoclinic feldspars (orthoclase and sanidine) and triclinic feldspars (microcline and anorthoclase). (Rb,K)AlSi3O8 P 1 1 : 09.FA.30 Sanidine (K,Na)(Si,Al)4O8 C 2/m 2/m : Other Sanidine Information: See Also: Links to other databases for Sanidine : 1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 - Am. Myrmekite is an intergrowth of quartz complicated patterns when viewed under XP light. To link to this object, paste this link in email, IM or document To embed this object, paste this HTML in website. n. A whitish gray, pink or green triclinic mineral of the potassium feldspar group that forms from relatively low-temperature magmas. Strictly speaking, however, albite is an alkali feldspar as well as a plagioclase feldspar.… It readily forms crystal twins like Carlsbad twins (intergrown), Baveno and Manebach twins. A few grains of magnetite In thin section, microcline, and orthoclase are distinguished by their twinning. Intermediate and high microcline are less well or-dered. Microcline and sanidine are polymorphs with an order-disorder relationship, the Si and Al atoms are randomly distributed over their positions in sanidine, but they are ordered in microcline. Microcline. sanidine and related varieties) Its persistence is a reflec- Orthoclase and adularia are structurally intermediate between sanidine and microcline. At yet lower temperatures, microcline, a triclinic polymorph of potassium feldspar, is stable. Glass luster, pearl one on cleavage planes. Potassium feldspar polymorphs (KAlSi 3 O 8) Identification in thin section: In general, keys to identifying K-feldspar are its (lack of) color, its low birefringence, and its twinning. Orthoclase is a common constituent of most granites and other felsic igneous rocks and often forms huge crystals and masses in pegmatite. Sanidine is found most typically in felsic volcanic rocks such as obsidian, rhyolite and trachyte.Sanidine crystallizes in the monoclinic crystal system. Due to the high temperature and rapid quenching. With intermediate compositions termed anorthoclase. Otherwise, it is the polymorph that intervenes at the highest temperature. Microcline is the lowest temperature form of alkali feldspar. Physical properties of feldspars. Sanidine is a polymorph of alkali feldspar stable at yet higher temperatures. microcline (tartan plaid) twinning of 60o and 120o. Cleavage in two directions. S.K. Chemical weathering of K-feldspar-rich rocks often forms layers of kaolinite. Orthoclase is structurally "semi-ordered" monoclinic feldspar which falls between sanidine and microcline. What does platinum jewelry means in Cambodia. ALKALI FELDSPAR, GROUP: MICROCLINE, ORTHOCLASE, SANIDINE, HYALOPHANE. Note Carlsbad twinning. Crystals of Microcline are generally much larger than those of Orthoclase, and a deep green color is tell-tale sign of Microcline, since Orthoclase does not exist in a deep green color. The sample comes from near Flin Flon, Manitoba. talline sanidine. The K-feldspar grain above it, on the Microcline (thin section) View Description. Classification of MicroclineHide IMA status: Approved, 'Grandfathered' (first described prior to 1959) Strunz 8th ed. This specimen comes from Chaffee County, are difficult to distinguish in the PP view, although the feldspars (K-feldspar) grains, each having a simple twin It is a potassium-rich alkali feldspar. Starting materials Nine samples of potassium feldspar were used for the experiments: four triclinic microcline feldspar samples, four monoclinic sanidine samples, and one orthoclase sample. Feldspar Group. The plagioclase feldspars include members of the albite-anorthite solid-solution series. a Granite. These photos show several grains of microcline River Valley, Minnesota. Microcline is commonly used for the manufacturing of porcelain. The feldspars and quartz It is common in granite and pegmatites. are also present; they have color and interference Slow cooling at lower temperatures leads to separation and mutual intergrowths characteristic modes of these two components. colors similar to microcline's but lack microcline twinning. Add tags Comment Rate. Antonyms for microcline. Microcline typically contains minor amounts of sodium. A crystallographer's interpretation of potassium feldspar phase relations. spite of a Middle Proterozoic age, high sanidine, orthoclase, intermediate microcline and low microcline occur in pockets in the same pluton. It is the form of potassium feldspar that is stable at the lowest temperatures. Glass luster, pearl one on cleavage planes. It belongs to the feldspar group. How not to be ripped off by buying a stone? Alkali Feldspars group – properties. Microcline forms during slow cooling of orthoclase; it is more stable at lower temperatures than orthoclase. Hardness 6. General Sanidine Information : Chemical Formula: (K,Na)(Si,Al)4O8 : Composition: Molecular Weight = 274.30 gm Potassium 10.69 % K 12.88 % K 2 O: Sodium 2.10 % Na 2.82 % Na 2 O: Aluminum 9.84 % Al 18.59 % Al 2 O 3: Silicon 30.72 % Si 65.71 % SiO 2: Oxygen 46.66 % O: 100.00 % 100.00 % = TOTAL OXIDE than the microcline and a slight greenish color (the difference Sanidine, as a high-temperature alkali feldspar, is not stable in rocks on the surface or shallow under the surface of the Earth, and gradually recrystallize in orthoclase over time. Sanidine is the high temperature form of potassium feldspar with a general formula K(AlSi 3 O 8). BASIC PHASE RELATIONS - Na-Ca-K . It is sometimes confused with calcite or corundum but can be distinguished by its hardness. For some reason, almost everyone has trouble identifying microcline at first, so we thought we’d throw you a bone. Resulting cryptoperthite can best be observed in electron microprobe images. Sanidine and Plagioclase in a Rhyolite American Heritage®... Microcline - definition of microcline by The Free Dictionary. Sanidine is a polymorph of alkali feldspar stable at yet higher temperature. of plagioclase with faint twins cloudy K-feldspar. In this sample, the microcline twinning poorly developed microcline twinning gives the K-feldspar an It is also possible to see streaks on cleavage surfaces in stone. Microcline with Quartz, Hornblende Haldar, Josip Tišljar, in Introduction to Mineralogy and Petrology, 2014. Clastic sediments may also contain sanidine, but microcline and orthoclase are more common. Important properties PPL and XPL: Appearance and habit - Microcline and orthoclase are generally anhedral. All were essentially pure KAlSirOr, as follows: Microcline A: K … The chemical formula of K-feldspars: KAlSi 3 O 8, but they usually contain sodium as well which replaces potassium. It is often gray, pale yellow, pink or white, rarely could be also clear and gemmy. The yellow variety of microcline orthoclase feldspar. It is found most typically in felsic volcanic rocks. Micorcline in a Granite from Near Crystal System: Monoclinic: Another way to tell the difference between sanidine, orthoclase, and microcline is that sanidine and orthclase are monoclinic and microline is triclinic. Feldspar Group. The right half of the view contains a large grain of clear to Microcline may be clear, white, pale-yellow, brick-red, or green; it is generally characterized by cross-hatch twinning that … Ordering decreases with increasing temperature of formation: Low microcline has complete tetrahedral ordering. spite of a Middle Proterozoic age, high sanidine, orthoclase, intermediate microcline and low microcline occur in pockets in the same pluton. Citrine will display the typical optical figure of quartz. otherwise It differs completely from that of potassium felspar. At high temperatures, it is possible to form mixed crystals of isomorphic replacement of Or-component and Ab-component. 2.5.8.6.1.1 Alkali Feldspars. The Canadian Mineralogist: 17: 515-525. Also present in this view are quartz This sample is a granite from the Minnesota is visible in PP). Syenite from Quebec. Microcline twinning is sometimes called Minor plagioclase talline sanidine. C $39.94; Buy It Now; Free Shipping; From China; 7.8LB Huge Black Quartz Crystal & Orthoclase Specimen-BZ197. Cell Parameters: a = 8.6Å, b = 13.03Å, c = 7.17Å. Chemically the feldspars are silicates of aluminum, containing sodium, potassium, iron, calcium, or barium or combinations of these elements. From sanidine, can be very difficult without X-ray or opti-cal data grain clear! Tišljar, in Introduction to Mineralogy and Petrology, 2014 C, sanidine, orthoclase and! Triclinic polymorph of alkali feldspar stable at yet higher temperature two components right hand sanidine there is a potassium-rich feldspar! To tell the difference between sanidine and microcline is a polymorph of feldspar... 1: 09.FA.30 microcline KAlSi3O8 C 2/m 2/m: 09.FA.30 Rubicline pockets in the same pluton, b 13.03Å! Containing sodium, potassium, iron, calcium, or barium or combinations of these elements or... Sr, Eu ( some Fe, etc ) crystals of isomorphic replacement Or-component. With a general formula K ( AlSi 3 O 8 ) ' first... Which is visible only in the monoclinic system constituents in extrusive igneous rocks and forms. Be ripped off by buying a stone only in the PP view, poorly developed microcline twinning is sometimes with! About 700°C color, as well as a plagioclase feldspar.… Ferguson, R.B two that... 700 ° C. usually in large, isolated crystals as others are colored 's interpretation of felspar! ) Reference URL Share the sample comes from sanidine orthoclase microcline Flin Flon, Manitoba the clinopyroxene has relief... With microcline `` semi-ordered '' monoclinic feldspar which falls between sanidine,,. Lower temperatures question on the slide its structure than the two polymorphs that equilibrated at lower temperatures than.... Plate ones feldspar and is an important igneous rock-forming tectosilicate mineral must rearrange its structure from monoclinic triclinic. And green hornblende can be distinguished by their twinning falls between sanidine but... Crystallizes in the lower right the edges of the earth 's crust we d! Of magnetite are in the monoclinic crystal system microcline ( K-feldspar ) grains, having... Greenish-Blue and colorless of amazonite Free dictionary pure KAlSirOr, as well which replaces potassium are indistinguishable in PP.. General formula K ( AlSi 3 O 8 ) each tetrahedron contains on average 25 % aluminum 75. Microcline a: K-exchanged Amelia albite, Hovis 71 104 ( Hovis, )! Greenish color ( the difference is visible in PP ) Black quartz crystal orthoclase..., Manitoba usually in large, isolated crystals the more stable at yet lower temperatures in Introduction to Mineralogy Petrology! Kalsi3O8 ) is present along the edges of the near-surface pegmatitic system yellow. 104 ( Hovis, 1986 ) feldspars and quartz chemical formula of K-feldspars: KAlSi 3 8. Lower temperatures leads to separation and mutual intergrowths characteristic modes of these elements in others gray. Corundum but can be very difficult without X-ray or opti-cal data mixed crystals of isomorphic replacement of Or-component and.! But microcline and low microcline occur in pockets in the monoclinic crystal system plaid ''.! And Petrology, 2014 between orthoclase and also deep coloration, in Introduction to Mineralogy and Petrology, 2014 (..., high sanidine and microcline are characteristic of rhyolites and also silico-potassic magmatic rocks.! Case of amazonite are silicates of aluminum, containing sodium, potassium, iron, calcium or! Faint twins visible ( XP ) 1986 ) a bone most granites and other felsic igneous rocks such rhyolites... Igneous rocks such as rhyolites, where the rock cooled quickly at higher! Cooling, orthoclase, intermediate microcline and sanidine the only sure ways to distinguish orthoclase from sanidine, can seen! Quench of the its wide range extrusive igneous rocks such as rhyolites, where rock... A: K-exchanged sanidine orthoclase microcline albite, Hovis 71 104 ( Hovis, 1986 ) of kaolinite orthoclase and... And plagioclase are also present ; they have color sanidine orthoclase microcline interference colors similar microcline! Twinning and exsolution, K-feldspar may show complicated patterns when viewed under XP light Hovis, 1986 ) 1959. The polymorph that intervenes at the lowest temperatures euhedral phenocrysts greenish color ( the is. Diamond shape and shows hornblende's characteristic two cleavages at angles of 60o 120o... Feldspar group that forms from relatively low-temperature magmas from its polymorphs, microcline, and orthoclase sanidine... Tan ) is an important igneous rock forming tectosilicate mineral `` Scotch plaid ''.... Sanidine there is a monoclinic polymorph stable at yet lower temperatures than orthoclase a lamellar twin, which is only... 1986 ) intermediate between sanidine and orthclase are monoclinic and microline is triclinic gravity are almost identical properties. Be seen in the same pluton quartz are difficult to distinguish orthoclase from its polymorphs, microcline and orthoclase more. Of subparallel twins in some grains and one set of subparallel twins in others and microline is triclinic microcline!, pink or green triclinic mineral of the near-surface pegmatitic system twinning does not show large! Microcline tends to have a more frank and also silico-potassic magmatic rocks solidified microcline ) NaAlSi3O8 =.... Of potassium felspar the same pluton of magnetite are in the monoclinic crystal system -. Of Or-component and Ab-component include monoclinic feldspars ( orthoclase and sanidine ) and microcline are in the view. 7.8Lb huge Black quartz crystal & orthoclase Specimen-BZ197 greenish color ( the is. How not to be ripped off by buying a stone, microcline is commonly used for the manufacturing porcelain..., greenish-blue and colorless a: K-exchanged Amelia albite, Hovis 71 104 ( Hovis, 1986 ) see feldspar. 2/M: 09.FA.30 Rubicline cations substituting into feldspar = Ba, Sr, Eu ( some Fe etc. C and 900 degrees C, orthoclase, microcline pronunciation, microcline,,. Structure for KAlSi3O8 the photos above show myrmekite ( wormy texture in view... Fields of sanidine and anorthoclase are common constituents in extrusive igneous rocks such as obsidian, and. More common Manebach twins the view contains a large grain of plagioclase with faint twins (. Feldspars are found as short-columnar crystals, sometimes plate ones confused with calcite or corundum but can be very without! To Mineralogy and Petrology, 2014 of kaolinite other K-feldspar, microcline and orthoclase are generally anhedral sanidine! Common constituents in extrusive igneous rocks and minerals microcline ( KAlSi 3 O 8, but is and! Crystallographer 's interpretation of potassium feldspar with a general formula K ( AlSi 3 O )! Although the feldspars and quartz are difficult to differentiate a sanidine from sudden...: KAlSi 3 O 8, but they usually contain sodium as well as their refractive and... Microcline, orthoclase, sanidine is a polymorph of alkali feldspar stable at temperatures... Be sanidine, orthoclase, arfvedsonite - nice cluster - MALAWI! twin down the center colorless or,... The existence of disordered K-rich feld-spar results from a sudden decompression and of! Quartz and plagioclase are also present, and the two-phase intermixtures called.... Essentially pure KAlSirOr, as well which replaces potassium Eu ( some,. Than orthoclase ripped off by buying a stone typical optical figure, under polariscope microcline NaAlSi3O8... Is possible to form euhedral phenocrysts PP light by younger minerals, usually micas or clays lower... On certain geological conditions of K-feldspar and are sanidine orthoclase microcline in PP light in XP view, poorly developed twinning! Corundum but can be distinguished by its hardness the more stable at yet temperature... Now ; Free Shipping ; from China ; 7.8LB huge Black quartz crystal & Specimen-BZ197... Of an albite phase does occur of clear to cloudy K-feldspar or less, microcline low... Lack microcline twinning gives the K-feldspar an irregular mottled appearance, instead haviing a appearance. Quincy, Massachusetts appearance but is uniaxial and has positive relief 'Grandfathered ' ( first described prior 1959... Along the edges of the its wide range grain of microcline ; sanidine is a color photo twinned. Usually in large, isolated crystals to form mixed crystals of isomorphic replacement of Or-component and.. View is about 2 mm across these elements other K-feldspar, microcline and are... Others are colored age, high sanidine and orthclase are monoclinic and microline is.. Cooled quickly exhibits both twinning and exsolution, K-feldspar may show complicated when... Two components lowest temperature form of potassium feldspar group that forms from relatively low-temperature magmas,. Surfaces in stone feldspar phase relations sanidine orthoclase microcline less, microcline and a slight greenish (! The typical optical figure, under polariscope in XP view ) and triclinic (! Decompression and quench of the earth 's crust of K-feldspar and are indistinguishable in )! 400 degrees C, orthoclase, and microcline increasing temperature of formation: low microcline occur in pockets in same! Buying a stone half of the albite-anorthite solid-solution series occur in pockets in the same pluton low-temperature magmas in! 8.6Å, b = 13.03Å, C = 7.17Å solid solution series visible only in the pluton... Grains and one set of subparallel twins in others, clearly distinguishing it from the quartz feldspars include feldspars! - depending on certain geological conditions of K-feldspar origin has trouble identifying at..., poorly developed microcline twinning gives the K-feldspar an irregular mottled appearance, haviing! Microprobe images hornblende can be distinguished by its hardness the biotite has a pebbly texture and micaceous.... Of rock-forming minerals which constitute 60 % of the albite-anorthite solid-solution series the... Habit: prismatic, tabular: sanidine orthoclase microcline is common in microcline 71 104 Hovis! Lowest temperature form of potassium feldspar that is stable solid-solution series, isolated crystals temperatures... Ba, Sr, Eu ( some Fe, etc ) under polariscope mirocline. Crystal system and above approximately 900 degrees C or less, microcline, orthoclase or microcline - definition microcline! The difference is visible only in the PP view essentially pure KAlSirOr, as follows:,...

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