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Hillebrandite

Year of discovery: 1908 (Terneras mine, Mexico), 1965 (Japan)

Locality list: 5 localities of hillebrandite

• Ca₂SiO₃(OH)₂
• [Ca²⁺₂][(OH)₂|SiO₃]^4-

• Class: Inosilicate (Single chain) - Hydroxide

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

• Cleavage: Distinct on {010} (1 plane)
• Hardness: 5-5.5
• Density: 2.7

• System: Orthorhombic
• Group: mmm, Cmcm
• Lattice: a=3.6, b=16.3, c=11.8