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Thaumasite

Year of discovery: 1878 (Bjelke mines, Sweden), 1972 (Japan)

Locality list: 5 localities of thaumasite

• Ca₃Si(CO₃)(SO₄)(OH)₆,12H₂O
• [Ca²⁺₃][CO₃|SO₄|H₆Si⁴⁺O₆]^6-,12H₂O

• Class: Charlesite group
• Class: Other silicates - Sulfate - Carbonate - Hydrate
• Fluorescence: Long UV excitation (White)

• CO₃ => H₄BO₄: Buryatite

• Si => Mn: Jouravskite
• Si => Ge: Carraraite

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

• Cleavage: Poor
• Hardness: 3.5
• Density: 1.9

• System: Hexagonal
• Group: 6, P6₃
• Lattice: a=11.0, c=10.4