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Mirabilite (Photo)

Year of discovery: 1845 (World), 1918 (Japan)

Locality list: 12 localities of mirabilite

• Na₂SO₄,10H₂O
• [Na⁺₂][SO₄]^2-,10H₂O

• Class: Sulfate - Hydrate
• Soluble in: Water
• Insoluble in: HCl
• Taste: Cooling
• Dehydrates to Thénardite under dry condition.

• Color: Colorless, White
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Opaque

• Cleavage: Perfect on {100} (1 plane), Poor on {001}, {010}, and {011} (3 planes)
• Hardness: 1.5-2
• Density: 1.5

• System: Monoclinic
• Group: 2/m, P2₁/a
• Lattice: a=12.8, b=10.4, c=11.5, β=107.8