2.8" Purple Creedite Crystal Cluster - Dachang Mine, China

Creedite is a complex aluminum salt with the chemical formula of Ca3SO4Al2F8(OH)2 · 2H2O. It typically forms from metamorphic rock as a fluorite oxidation in fluorite ore deposits. Generally crystals form in radial aggregations, but under rare circumstances will form as single prismatic crystals up to 1 millimeter long. Creedite has been found in a variety of different colors, but most often displays orange, purple, or clear colorless crystals.