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Alkali feldspar
The
alkali feldspar
group are those
feldspar
minerals
rich in the
alkali
elements
,
potassium
and
sodium
. The alkali feldspars include
albite
,
anorthoclase
,
microcline
,
orthoclase
and
sanidine
. Albite is considered as one of the alkali feldspars according to its chemical composition and it is also the alkali endmember of the
plagioclase
series.
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