Learn about Anhydrite
water-free CaSO4 crystals with orthorhombic cleavage, blue to lilac hues; prized for sharp forms, angelite color, and rare, unaltered specimens.Empire State No. 4 Mine
A collector's guide to Empire State No. 4 Mine, USA: its geology, mining history and notable minerals, illustrated with the 90 specimens documented from this locality on EarthWonders.
Comments