Prehnite 12x16-18x25mm Jagged Rough Collar 48hr_10072025 Silica-rich waters create hardened deposits

Silica-rich waters create hardened deposits that preserve coral skeletons

No two are exactly alike

also known as the Stone Age

as well as translucent and iridescent

Prehnite 12x16-18x25mm Jagged Rough Collar 48hr_10072025 Silica-rich waters create hardened depositsPrehnite 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.