Belomorite (Russian: беломорит), sometimes peristerite, moonstone, murchisonite, Ceylon opal, or hecatolite, is a decorative variety of albite (oligoclase) of white or light gray color with a distinct iridescence effect. By composition, belomorite belongs to the feldspar family; it is a sodium aluminosilicate from the plagioclase group, in most cases belonging to the isomorphic series albite (Ab) — anorthite (An) with an approximate percentage of 70Ab-30An.
Belomorite (Russian: беломорит), sometimes peristerite, moonstone, murchisonite, Ceylon opal, or hecatolite, is a decorative variety of albite (oligoclase) of white or light gray color with a distinct iridescence effect. By composition, belomorite belongs to the feldspar family; it is a sodium aluminosilicate from the plagioclase group, in most cases belonging to the isomorphic series albite (Ab) — anorthite (An) with an approximate percentage of 70Ab-30An.
Source: Wikipedia "Belomorite" · CC BY-SA 4.0
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