Prehnite
First mineral named after a person (Colonel Hendrik von Prehn, 1788). Butterscotch-green masses come from South Africa's Bushberg, Australia's Prospect Sydney and Mali's new translucent pockets.
Known origins & mines
Bushberg Prehnite Pockets · South Africa
Where prehnite was first described (1788) — Bushberg's butterscotch-green botryoidal masses defined the species and still surface in old dum…
Merelani Block C · Tanzania
The industrial heart of tanzanite: deep shafts following zoisite veins in graphitic gneiss. Block D near-surface pockets yielded record 2200…
Kayes Bafoulabe Prehnite · Mali
West African diggings near Bafoulabe that flooded the market from the 2000s with clean saturated blue-green faceting-grade prehnite balls.…
Prospect Sydney Quarry · Australia
Sydney's Prospect quarry produced world-class prehnite-epidote combinations now locked in museums — quarrying ended but specimens remain ben…