Learn about Anhydrite
water-free CaSO4 crystals with orthorhombic cleavage, blue to lilac hues; prized for sharp forms, angelite color, and rare, unaltered specimens.Paterson
Paterson, USA — historic New Jersey trap-rock locality yielding prehnite, datolite, pectolite, calcite and zeolites; a classic destination for collectors.
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