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Spurrite [abbr. Spu ]

Year of discovery: 1908 (Terneras mine, Mexico, and Darwin, USA), 1970 (Japan)

Locality list: 5 localities of spurrite

• Ca₅(SiO₄)₂(CO₃)
• [Ca²⁺₅][CO₃|(SiO₄)₂]^10-

• Class: Nesosilicate
• Soluble in: HCl (with bubbles, Gel residue)
• Fluorescence: Short UV excitation (Green)

• Color: Colorless, Pale blue
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent

• Cleavage: Distinct on {100} (1 plane)
• Hardness: 5
• Density: 3.0

• System: Monoclinic
• Group: 2/m, P2₁/a
• Lattice: a=10.5, b=6.7, c=14.2, β=101.3