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Glauberite

Year of discovery: 1808 (Virgen del Castellar mine, Spain), 1987 (Japan)

Locality list: A locality of glauberite

• Na₂Ca(SO₄)₂
• [Na⁺₂][Ca²⁺][(SO₄)₂]^4-

• Class: Sulfate
• Soluble in: Water (Decompose), HCl
• Fluorescence: UV excitation (Bluish gray)
• Hydrate to Gypsum releasing Na₂SO₄.
• Hydrate to Glauberite.

• Color: White, Yellowish brown
• Streak: White
• Luster: Greasy
• Diaphaneity: Transparent-Translucent

• Habit: Platy, Bipyramidal

• Cleavage: Perfect on {001} (1 plane), Imperfect on {110} (2 planes)
• Hardness: 2.5-3
• Density: 2.8

• System: Monoclinic
• Group: 2/m, C2/c
• Lattice: a=10.1, b=8.3, c=8.5, β=112.2