Prehnite 3x4mm Rondelle Faceted A Grade - 15-16 Inch R1231 a Greek philosopher and botanist

a Greek philosopher and botanist who also named the stone

Golden Obsidian is a naturally occurring volcanic glass

a hydrous copper silicate

Unsealed granite may discolor when exposed to oil

Rainbow Moonstone is named for its moon-like glow or chatoyancy

Prehnite 3x4mm Rondelle Faceted A Grade - 15-16 Inch R1231 a Greek philosopher and botanistPrehnite was the first mineral to be named after a person: its discoverer, Dutch Colonel Hendrik Von Prehn. Von Prehn discovered the stone in South Africa in 1774. Prehnite is translucent to transparent, in colors from light green to yellow green to olive, with occasional inclusions of Black Tourmaline that crisscross the stone in fibrous patterns. It is a phyllosilicate composed of silicon, calcium and aluminum with trace amounts of iron.