Creedite Colorado Fluorspar Company Mine Wagon Wheel Gap Mineral County, Colorado

摘要

CREEDITE, Ca3Al2(S04)(OH)2F8-2H2O, is a calcium aluminium sulfate fluoro-hydroxide. It forms colorless to white to purple, mono clinic prismatic crystals, frequently in acicular radiating sprays of fine prisms. It is translucent to transparent, with a hardness of 3.5-4 and a specific gravity of 2.7. At its type locality, creedite formed white to colorless grains and poorly developed crystals to 5 mm associated with barite and kaolinite or halloysite.