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Offretite. Mont Semiol, Loire, France. FOV=1.5 mm Photo © Volker Betz

Ouachita Mountains, Hot Springs County, Arkansas

Strengite - Les Montmins Mine, Allier, Auvergne, France. Chemical Formula FePO4 · 2(H2O) Composition Iron phosphate, often with some aluminum - See more at:

Faujasite-Na (Na2,Ca,Mg)3.5[Al7Si17O48]•32(H2O), Limberg Quarries, Germany

Fluorite (CaF2) Blue Fluorite with Phantom Purple - Macro view of a very small but special fluorite crystal speciment, only 1 1/4" tall, captured through the glass display case. This shows a clear blue outer row of translucent blue cubes grown over an initial purple crystal.from cobalt123. I really like blue Fluorite.

Erionite-K, (K2,Ca,Na2)2[Al4Si14O36]·15H2O, Yaquina Head Quarry, Agate Beach, Lincoln Co., Oregon, USA. Copyright © Volker Betz (2011)