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Additional
sanidine
English Wikipedia - The Free Encyclopedia
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Sanidine
Sanidine
is the high temperature form of potassium
feldspar
with a general formula K(AlSi
3
O
8
). Sanidine is found most typically 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.
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