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**Chemical formula:** CaSO₄·2H₂O **Hardness:** 1.5–2 **Density:** 2.3–2.4 g/cm³ **Crystal system:** Monoclinic **Luster:** Vitreous to resinous **Description:** Gypsum naturally occurs as flattened, often twinned crystals. A transparent form of gypsum is known as selenite. A massive, fine-grained, white or lightly tinted variety is called alabaster, commonly used in sculpture. Gypsum can also be used as a fertilizer and as the main constituent in various types of plaster used in construction. ## Keywords mineral gypsum texture color ornamental stone semi-precious gemstone
