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Thénardite, Thenardite

Year of discovery: 1826 (Espartinas Saltworks, Spain), 1962 (Japan)

Locality list: 14 localities of thénardite

• Na₂SO₄
• α-[Na⁺₂][SO₄]^2-

• Class: Sulfate
• Soluble in: Water
• Insoluble in: HCl
• Fluorescence: UV excitation (White)
• Formed on dehydration of Mirabilite under dry condition.

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

• Cleavage: Perfect on {010} (1 plane), Good on {101} (2 plane), Imperfect on {100} (1 plane)
• Hardness: 2.5-3
• Density: 2.7

• System: Orthorhombic
• Group: mmm, Fddd
• Lattice: a=5.9, b=12.3, c=9.8