Orthoclase, or orthoclase feldspar (endmember formula K Al Si 3 O 8), is an important tectosilicate mineral which forms igneous rock.The name is from the Ancient Greek for "straight fracture," because its two cleavage planes are at right angles to each other. It is a type of potassium feldspar, also known as K-feldspar.The gem known as moonstone (see below) is largely composed of orthoclase.
General Orthoclase 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
Orthoclase Crystals in Matrix Mineral Specimen *3M Quarry, Arkansas*. C $2.81. Top Rated Seller. Top Rated Seller. or Best Offer. +C $48.62 shipping. from United States.
Named "orthose" in 1801 by Rene Just Haüy from the Greek orthos - "right" in allusion to the mineral's right angle of good cleavage. The sense of Haüy's name was that the mineral was a feldspar, but he did not specify a type-locality, nor did Haüy give a chemical analysis. The name was changed in 1823 to orthoklas by Johann Friedrich August ...
Orthoclase can be found in many composite minerals like granite but these deposits are not considered gem quality. Australia Burma (Myanmar) Madagascar Sri Lanka the United States and Zimbabwe have mining operations for gem-quality orthoclase. However the best quality deposits are found in Madagascar where Shop LC sources orthoclase.
The Strzegom granite quarries are a classic locality for pegmatite minerals. In this case, creamy white Orthoclase crystals are seen on a matrix of bright snowy white Albite crystals. These are accompanied by very dark Quartz crystals (smoky variety) and light brown Stilbita-Ca crystals, making the whole an attractive combination.
Potassium feldspar or K-Feldspar belongs to a group of potassium aluminium silicate minerals, including orthoclase, microcline and adularia. The mineral contains small quantities of radioactive uranium that slowly forms radon gas, a major cause of lung cancer. K-Feldspar is also a major source of lead emissions.
Freda Rebecca Mine, Bindura District, Mashonaland Central, Zimbabwe : An open-pit gold mine started in 1985 (formerly operated by Promotor and Botha Mines). Annual production since 1988 is around 1.5 tons of gold, at an average recovery grade of 1.5 g Au/ton.
Mineral specimens from around the world. $120 Pyromorphite, Daoping Mine, Gongcheng Co., Guilin Prefecture, Guangxi Zhuang Autonomous Region, China
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Orthoclasse. Orthoclase is the transparent to opaque form of yellow potassium feldspar. This mineral is sometimes mistaken for citrine or yellow beryl and is primarily found in Madagascar. The name orthoclase comes from the Greek for "break straight," because this variety of feldspar is frequently found with crystals joined at a 90 degree angle.
Orthoclase is the characteristic potassium feldspar of igneous rocks, occuring both alone and in perthitic intergrowth with albite; it also occurs in some metamorphic rocks. The variety adularia is formed at comparatively low temperatures, typically in veins. Microcline, being an ordered polymorph, is usually formed at lower temperatures than ...
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Adularia is a variety of feldspar found in hydrothermal veins in mountainous areas, from one of which it derives its name: the Adular Mountains of Switzerland. It commonly forms as colorless to white, cream, pale yellow to pink, or reddish-brown, glassy, prismatic, twinned crystals. These transparent to colorless gems often display a white to ...
Microcline Feldspar is an important igneous rock-forming tectosilicate mineral. It is a potassium-rich alkali feldspar. Microcline typically contains minor amounts of sodium. It is common in granite and pegmatites. Microcline forms during slow cooling of orthoclase; it is more stable at lower temperatures than orthocla
This gorgeous specimen contains an association metallic anatase crystals, cubic limonite after pyrite and adularia (variety of orthoclase). It was collected from Hardangervidda, Norway and entire specimen measures 2 x 1.8". This specimen has been mounted to an acrylic display base with mineral tack.
Zomba mountain associated to the Zomba Plateau in Malawi yields a diversity of minerals in complex arrangements and mix of associations. Orthoclase is a primary matrix, with Smokey quartz, aegirine & zircon being the most commonly occurring species. The deposits are widespread and show a diversity of habits and forms.
4 Answers. The minerals that make up Granite are quartz, feldspars (microcline, orthoclase, albite), biotite, muscovite, (sometimes contain hornblende, augite, magnetite, zircon). Granite is made up of Hornblende, mica, feldspar, and quartz. There are more but …
What mineral can scratch a piece of glass – Wiki Answers. Any mineral with roughly a hardness of 6 or more on the Mohs scale of mineral hardness could scratch glass, which is … Some minerals that could scratch glass would be quartz, topaz, corundum, and diamond. … Any type of feldspar or quartz . »More detailed
MINERAL LOCATION FORMULA; Agate: Battlefields: SiO2 silicon dioxide: Adamite: ati mine: Zn2AsO4OH: Angelisite: ati mine: PbCu[(OH)2|SO4] Andalusite: Karoi ...
Orthoclase Mineral Facts: A Potash Feldspar or K-spar. Potassium-aluminium silicate, with Silica 64.7%, alumina 18.4%, potassium 16.9%. Sodium sometimes replaces a portion of the potash. Colors: white, gray, flesh-red, more rarely green. The streak of orthoclase is white. Hardness: 6 to 6.5.
Swaziland, or even as far as Zimbabwe (V on Brunn, ... SEM backscatter image showing three small gold inclusions in an orthoclase grain from a heavy mineral lens in Unit B of the.
Orthoclase – from Greek for straight and fracture, in reference to the cleavage angle, which is 90°. Feldspar (mineral group name), from Swedish names for field (feldt or falt) and spar (spat), in reference to the spar in tilled fields overlying granite; in German the word became Feldspat.
Excalibur Mineral Corporation - Rare Species O-R. Rare Species O-R. The following is an abbreviated "names and localities" list of specimens that have been described in our recent catalogs. In all cases, one or more specimens of each of the listed items is on hand as of early 2004. Note that this is only a partial list of the more than 200,000 ...
Orthoclase er i positionen for ekstremt kaliumindhold. Ortoklase som et Feldspar-mineral. Orthoclase er medlem af alkali-feldspar-serien. Alkali-feldspadene inkluderer albite (NaAlSi 3 O 8), anorthoclase ((Na, K) AlSi 3 O 8), sanidine ((K, Na) AlSi 3 O 8), orthoclase (KAlSi 3 O 8) og mikroklin (KAlSi 3 O 8).
Bindura District, Mashonaland Central, Zimbabwe : Bindura is one of eight districts in the Mashonaland Central province of Zimbabwe. The district capital is the town of Bindura. ... This is a list of exploitable or exploited mineral commodities recorded from this region. ... ⓘ Orthoclase.
Orthoclase. Orthoclase is frequently known as potassium feldspar or K-spar, and is easily distinguished from the plagioclase feldspars in hand sample by its lack of striations. In thin section, alkali feldspar grains often look like they're sprinkled with dirt (PPL) or tiny confetti (XPL). You can find the explanation on the alkali feldspar page.
Carlsbad Law - [001] - forms a penetration twin in the mineral orthoclase. Crystals twinned under the Carlsbad Law show two intergrown crystals, one rotated 180 o from the other about the [001] axis. Carlsbad twinning is the most common type of twinning in orthoclase, and is thus very diagnostic of orthoclase when it occurs.
Copper is a metal used in coins, electronics, pipes, wiring, motors, alloys and many other products. Uses of Talc. Talc is a soft mineral used in cosmetics, paper, paint, ceramics and many other products. Magnesite. Magnesite is a carbonate mineral used for chemicals, fire …
PE Orthoclase = 2.85 barns/electron U=PE Orthoclase x r electron = 7.20 barns/cc. Radioactivity: GRapi = 200.97 (Gamma Ray American Petroleum Institute Units) Concentration of Orthoclase per GRapi unit = 0.50 (%) Estimated Radioactivity from Orthoclase - barely detectable : Orthoclase Classification: Dana Class: 76.01.01.01 Tectosilicate Al-Si ...
