Minerals / Gypsum, Crete.
Gypsum, CaSO4 . 2H2O calcium sulphate dihydrate, is an evaporite mineral. This specimen was formed as a saline residue arising from the evaporation of an enclosed basin of sea water. Of the two specimens, one appears to be a loose aggregate, and the smaller one has obvious layering. The location is loosely given as Crete.
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