Orthoclase
Orthoclase is a member of the feldspar group (like plagioclase) and is a framework silicate. Orthoclase, also known as alkali feldspar or K-feldspar, is one end-member of a solid solution between orthoclase and albite.Orthoclase is found in silica-rich igneous rocks such as granite, and in high grade metamorphic rocks.
Chemical composition - KAlSi
3O
8
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