Gypsum (variety: Satin Spar) — mineral Identification & Properties | Geo-Gem
Gypsum (variety: Satin Spar) is a mineral. Scratch the specimen with your fingernail; if it scratches easily, this is a point for gypsum. Check for a fibrous structure—satin spar gypsum is fibrous and displays silky luster on cleavage faces. If available, perform a streak test on u…