Editing Anorthoclase (section)

==Occurrence==

Anorthoclase occurs in high temperature sodium rich [[volcanic]] and [[hypabyssal]] (shallow intrusive) rocks. The mineral is typically found as a constituent of the fine grained [[Matrix (geology)|matrix]] or as small phenocrysts which may occur as loose crystals in a weathered rock.<ref name=HBM/>

It was first described in 1885 for an occurrence on [[Pantelleria Island]], [[Trapani Province]], [[Sicily]]. The name is from the Greek αν-, ορθός and κλάσις (not cleaving at right-angles), for its oblique cleavage.<ref name=HBM/><ref name=Mindat/>