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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 ...
Detailed description, properties, locality information guide about the potassium feldspar mineral orthoclase and adularia.
Orthoclase Lorenzenite. Comments: Striated, dark violet crystal of lorenzenite in cream-colored orthoclase. Location: Khibiny Massif, Kola Peninsula, Russia.
Orthoclase is a polymorph of other minerals that share the same chemistry, but have different crystal structures. If positive identification between these minerals ...
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, common alkali feldspar mineral, a potassium aluminosilicate (KAlSi 3 O 8); it usually occurs as variously coloured, frequently twinned crystals in granite.
Definition of ORTHOCLASE: a monoclinic mineral of the feldspar group consisting of a silicate of potassium and aluminum . See orthoclase defined for kids
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 ...

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