Adularia

From Wikipedia, the free encyclopedia

Adularia with pyrite incrustations.
Adularia with pyrite incrustations.

Adularia is a tectosilicate mineral with formula KAlSi3O8. It is a form of orthoclase which crystallizes at unusually low temperatures. It is found in the Adula Mountains of Switzerland. The genesis is usually hydrothermal (low temeperature alpine veins).