Selenite & Satin Spar
Satin spar is a fibrous form of gypsum known for its silky, pearly lustre that resembles satin. This mineral typically forms in sedimentary environments. Satin spar is commonly mistaken for selenite, another gypsum variety, due to its similar appearance. However, the fibrous structure of satin spar gives it a distinctive sheen. Significant sources include Mexico and the United States.
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