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Tilleyite [abbr. Tly ]

Year of discovery: 1933 (Crestmore quarries, USA), 1971 (Japan)

Locality list: 6 localities of tilleyite

• Ca₅Si₂O₇(CO₃)₂
• [Ca²⁺₅][(CO₃)₂|Si₂O₇]^10-

• Class: Tilleyite group
• Class: Sorosilicate - Carbonate

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

• Cleavage: Perfect on {100} (1 plane), Good on {101} (1 plane)
• Density: 2.8

• System: Monoclinic
• Group: 2/m, P2₁/a
• Lattice: a=15.1, b=10.2, c=7.6, β=105.2