Explore museum-quality mineral specimens from around the world. Each piece has been carefully selected by Grant Powell for its exceptional beauty, rarity, and scientific significance.
Cassiterite
Phlogopite (Mica) – Gem Green Crystal on White Dolomitic Marble
Cassiterite - World-Class Translucent Twin, Sculptural Masterpiece
Amo Tin (Sn) Deposit, Ximeng County, Yunnan Provin...
