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Anhydrite [abbr. Anh ]

Year of discovery: 1795 (Salt mine, Austria), 1900 (Japan)

Locality list: 97 localities of anhydrite

• CaSO₄
• [Ca²⁺][SO₄]^2-

• Class: Sulfate
• Soluble in: HCl

• Ca => Sr: Celestite
• Ca => Pb: Anglesite
• Ca => Ba: Baryte

• [] => 2H₂O: Gypsum
• [] => 0.5H₂O: Bassanite

• Color: Colorless-White
• Streak: White
• Luster: Vitreous
• Diaphaneity: Translucent-Transparent

• Habit: Thick tabular

• Cleavage: Perfect on {010} and {100] (2 planes), Good on {001} (1 plane)
• Hardness: 3-3.5
• Density: 3.0

• System: Orthorhombic
• Group: mmm, Amma
• Lattice: a=6.2, b=7.0, c=7.0

Etymology: An (no) - hydros (water) in Greek