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Oligoclase is a plagioclase feldspar mineral (70–90% albite) renowned for gem-quality varieties exhibiting optical phenomena.
Key varieties include sunstone (aventurine oligoclase with hematite/goethite inclusions), moonstone (white/blue-white with shiller/adularescence), and green adventurine feldspar.
Other recognized types include belomorite and oligoclase-albite.
Key Oligoclase Varieties and Types:
Sunstone (Aventurine Oligoclase): Often contains inclusions of hematite or goethite, giving it a glittering, reddish-brown, or golden appearance.
Moonstone (Oligoclase Variety): Known for its shimmering, pearly, or blue-white, blue-orange iridescent effect, often resulting from internal lamellae.
Green Adventurine Feldspar: A rarer, green-colored variety.
Belomorite: A trade name for a specific blue-white iridescent variety found near the White Sea.
Oligoclase-Albite:
A compositional variety transitional towards albite.
https://www.google.com/search?q=Oligocla...s-wiz-serp
Key varieties include sunstone (aventurine oligoclase with hematite/goethite inclusions), moonstone (white/blue-white with shiller/adularescence), and green adventurine feldspar.
Other recognized types include belomorite and oligoclase-albite.
Key Oligoclase Varieties and Types:
Sunstone (Aventurine Oligoclase): Often contains inclusions of hematite or goethite, giving it a glittering, reddish-brown, or golden appearance.
Moonstone (Oligoclase Variety): Known for its shimmering, pearly, or blue-white, blue-orange iridescent effect, often resulting from internal lamellae.
Green Adventurine Feldspar: A rarer, green-colored variety.
Belomorite: A trade name for a specific blue-white iridescent variety found near the White Sea.
Oligoclase-Albite:
A compositional variety transitional towards albite.
https://www.google.com/search?q=Oligocla...s-wiz-serp