· Orthoclase (Formula KAlSi 3 O 8 ), is an important tectosilicate mineral, which forms from or near igneous rock. It's known as Alkali Feldspar; is common in granite and some related rocks. Orthoclase is derived from the Greek phrase, " Straight Fracture ". Orthoclase is also known as Moonstone.

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 · Beryl (height of the largest crystal: 3.3 cm) Fukuoka mine, Nakatsugawa City, Gifu Prefecture, Japan. Stokesite (crystal size: 1 mm) Kerokubo, Kasagi-cho, Ena City, Gifu Prefecture, Japan. Topaz (crystal size: 5 cm) Naegi, Nakatsugawa City, Gifu Prefecture, Japan. Orthoclase, Baveno twin (crystal size: 9 cm)

Mining Engineering, August, 1998. Newcrest Mining Staff, 1997, Cadia gold-copper deposit, in Geology of Australian and Papua New Guinea Mineral Deposits (Eds. D.A. Berkman & D.H. Mackenzie) p641. (AusIMM, …

 · 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.

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Orthoclase Adelaide Mine, Iron Hill, Lake County, Colorado, USA Locality type: Mine Classification Species: Orthoclase Formula: K(AlSi3O8) Confirmation Validity: Confirmed Confirmation Methods: Visually Identified References References: Paul Broyles Specimen source: Personally collected Data Mineral Data: Click here to view Orthoclase data

 · Orthoclase. An important rock-forming mineral, orthoclase is the potassium-bearing end member of the potassium sodium feldspar solid-solution series. It is a major …

Orthoclase Mineral Data 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 % …

Orthoclase is frequently known as potassium feldspar or K-spar, and is easily distinguished from the plagioclase feldspars in hand sample by its …

What Is Orthoclase? Orthoclase is a feldspar mineral with a chemical composition of KAlSi 3 O 8. It is one of the most abundant rock-forming minerals of the continental crust. Orthoclase is most widely known as the …

 · Orthoclase is often confused with quartz - try looking for cloudy patches on individual crystals in plain polarized light which indicate weathering of the crystal. And check to see if the crystal is uniaxial or biaxial. Occurrence. Found in granite, granodiorite, syenite, and other felsic rocks.

 · Orthoclase (Formula KAlSi3O8), is an important tectosilicate mineral, which forms from or near igneous rock. It's known as Alkali Feldspar; is common in granite and some related rocks. Orthoclase is derived from the Greek phrase, "Straight Fracture". Orthoclase is also known as Moonstone. Orthoclase is the birthstone of June, along with …