Potassium feldspar

Potassium feldspar refers to a number of minerals in the feldspar group that contain large amounts of potassium in the crystal lattice.

* Orthoclase (endmember formula KAlSi3O8), an important tectosilicate mineral that forms igneous rock
* Microcline, chemically the same as orthoclase, but with a different crystalline structure
* Sanidine, the high-temperature form of potassium feldspar (K,Na)(Si,Al)

* Adularia, a more ordered low-temperature variety of orthoclase or partially disordered microcline
* Amazonite (sometimes called "Amazon stone"), a green variety of microcline

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