Albite
Sodium
aluminum silicate (Triclinic)
NaAlSi3O8
Albite
is a common felspar and is the "pivot" mineral of two
different feldspar series. It is most often associated with the
plagioclase series where it is an end member of this series. The
plagioclase series comprises felspars that range in chemical
composition from pure NaAlSi3O8 to pure CaAl2Si2O8.
Albite by definition must contain no less than 90% sodium and no more
than 10% of either potassium and/or calcium in the cation position in
the crystal structure.
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