正长石




正长石多产自岩浆岩或变质岩。如花岗岩、正长岩、霞石正长岩、麻岩、片岩、流纹岩,有时也可在沉积岩中看到。正长石变质后,可能成为高岭石、绢云母、沸石等矿物。
- Mindat.org网站
- Minerals.net网站
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单词 | orthoclase | |||||||
释义 |
orthoclase
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Orthoclase, or orthoclase feldspar (endmember formula KAlSi3O8), is an important tectosilicate mineral which forms igneous rock. The name is from the 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.
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