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- Feldspar in which K+ is diagnostic positive ion;
K(AlSi3O8).
Source: Leet, L. Don. 1982.
Physical Geology, 6th Edition. Englewood Cliffs, NJ: Prentice-Hall
- A monoclinic mineral, KAlSi3 O8 ; feldspar group; prismatic
cleavage; partly ordered, monoclinic potassium feldspar dimorphous with
microcline, being stable at higher temperatures; also a general term
applied to any potassium feldspar that is or appears to be monoclinic;
e.g., sanidine, submicroscopically twinned microcline, adularia, and
twinned analbite. It is a common rock-forming mineral and occurs esp. in
granites, granite pegmatites, felsic igneous rocks, and crystalline
schists, and is commonly perthitic. Syn:
common feldspar;
orthose;
pegmatolite. CF: microcline;
plagioclase;
anorthoclase.
Source:
Dictionary of Mining, Mineral, and Related Terms
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