Everything about Sanidine totally explained
Sanidine is the high temperature form of potassium
feldspar (K,Na)(Si,Al)
4O
8. Sanidine most typically occurs in
felsic volcanic rocks such as
obsidian,
rhyolite and
trachyte. Sanidine crystallizes in the
monoclinic crystal system.
Orthoclase is a
monoclinic polymorph stable at lower temperatures. At yet lower temperatures,
microcline, a
triclinic polymorph of potassium feldspar, is stable.
Due to the high temperature and rapid quenching, sanidine can contain more sodium in its structure than the two polymorphs that equilibrated at lower temperatures. Sanidine and high
albite constitute a
solid solution series with intermediate compositions termed
anorthoclase. Exsolution of an albite phase does occur; resulting cryptoperthite can best be observed in
electron microprobe images.
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