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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 Greek for ...
Orthoclase is one of the most common minerals, and occurs in numerous mineral environments. It is polymorphous with the minerals Microcline and Sanidine.
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 ...
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 ...
The particular feldspar that furnishes most of the moonstone is orthoclase, a silicate of potassium and aluminum.
Orthoclase is a polymorph of other minerals that share the same chemistry, but have different crystal structures. If positive identification between these minerals ...
Plagioclase Orthoclase: Feldspar is a name given to a class of aluminum-containing silicates which are sometimes called light silicates or "nonferromagnesian ...
Orthoclase as a mineral is a common feldspar, but when described as a gemstone it refers to a rare transparent yellowish form of the mineral Sanidine that is found in ...
Orthoclase: Property: Value: Comments: Formula: KAlSi 3 O 8 : Crystal System: Monoclinic: 2/m: Crystal Habit: ... Difficult to see in thin section due to very low relief.

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