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Orthoclase (endmember formula K Al Si 3 O 8) is an important tectosilicate mineral which forms igneous rock. The name is from the Greek for "straight fracture ...
Orthoclase is one of the most common minerals, and occurs in numerous mineral environments. It is polymorphous with the minerals Microcline and Sanidine.
Orthoclase Lorenzenite. Comments: Striated, dark violet crystal of lorenzenite in cream-colored orthoclase. Location: Khibiny Massif, Kola Peninsula, Russia.
Orthoclase is a rare gemstone that belongs to the feldspar group, which also includes moonstone, amazonite, spectrolite and labradorite. Therefore, orthoclase is ...
Coombs, D.S. (1954) Ferriferous orthoclase from Madagascar. Mineralogical Magazine: 30: 409-427. Wright, T. L. and Stewart, D. B. (1968) X-ray and optical study of ...
These large crystals are minerals in the feldspar family, namely the alkali feldspars orthoclase and microcline. The pink mineral is called orthoclase, a member of ...
Orthoclase is a polymorph of other minerals that share the same chemistry, but have different crystal structures. If positive identification between these minerals ...
orthoclase, common alkali feldspar mineral, a potassium aluminosilicate (KAlSi 3 O 8); it usually occurs as variously coloured, frequently twinned crystals in granite.
Orthoclase feldspar is a potassium aluminum silicate, and is commonly called "potassium feldspar" or simply "K-spar," given that the chemical symbol for potassium is ...
Orthoclase mineral is a silicate of potassium and aluminum, belonging to the Feldspar group. It has the same composition as microcline, but is stable at slightly ...

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