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Calderite

Year of discovery: 1850 (Wabush formation, Canada, and Otjosondu, Namibia), 1998 (Japan)

Locality list: A locality of calderite

• Mn₃Fe₂Si₃O₁₂
• (Mn,Ca)₃(Fe,Al)₂Si₃O₁₂
• [Mn²⁺₃][Fe³⁺₂][(SiO₄)₃]^12-

• Class: Pyralspite subgroup < Garnet group < Garnet supergroup
• Class: Nesosilicate

• Mn => Ca: Andradite
• Mn => Mg: Majorite

• Fe => Al: Spessartine
• Fe => V: Momoiite

• Color: Dark brown-Dark yellow
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: No
• Density: 4.1

• System: Cubic
• Group: m3m, Ia3d
• Lattice: a=11.8