Orthoclase - Orthose (mineral)

Orthoclase crystals, a selection of specimens of this crystallized mineral species. Orthoclase is a mineral, also called orthoclase in French, the adularia is a variety, here many pieces of collection presented with a description, one or more photos and sometimes a video. These orthoses and adularia are for sale.
It is a silicate, subgroup of tectosilicates, family of potassium feldspars, with chemical formula KAlSi3O8, and monoclinic crystal system.

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