Satin spar gypsum forms when dissolved calcium sulfate ions in water evaporate causing the crystals to precipitate out in a fibrous, silky texture. It is popular with mineral collectors for these beautiful qualities. Daphne and Leland Boone's turquoise-eyed
Horse is sculpted from satin spar gypsum to a dimension of approximately 3 1/4" long, 5/8" wide and 1 3/4" tall.
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