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Foshagite [abbr. Fos ]

Year of discovery: 1925 (Crestmore quarry, USA, and Commercial quarry, USA), 1971 (Japan)

Locality list: 6 localities of foshagite

• Ca₄(SiO₃)₃(OH)₂
• [Ca²⁺₄][(OH)₂|(SiO₃)₃]^8-

• Class: Inosilicate (Single chain) - Hydroxide
• Fluorescence: UV excitation (Yellow)

• Color: White
• Streak: White
• Luster: Silky
• Diaphaneity: Translucent

• Cleavage: Distinct on {001} (1 plane)
• Density: 2.4

• System: Monoclinic (PMa2b2c, PM2a2b2c) (Layer-stacking polytype)
• Group: 2/m, P2₁/m
• Lattice: a=10.3, b=7.4, c=14.1, β=106.4