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Scawtite

Year of discovery: 1930 (Scawt Hill, UK), 1965 (Japan)

Locality list: 6 localities of scawtite

• Ca₇Si₆O₁₈(CO₃),2H₂O
• [Ca²⁺₇][CO₃|(SiO₃)₆]^14-,2H₂O

• Class: Cyclosilicate (Single ring) - Carbonate - Hydrate

• Color: Colorless
• Streak: White
• Luster: Vitreous
• Diaphaneity: Tranparent

• Cleavage: Perfect on {001} (1 plane), Poor on {010} (1 plane)
• Hardness: 4-5
• Density: 2.8

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=10.1, b=15.2, c=6.6, β=100.6