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Spessartine (Photo) [abbr. Sps ]

Year of discovery: 1832 (Sommer quarry, Germany), 1899 (Japan)

Locality list: 328 localities of spessartine

• Mn₃Al₂(SiO₄)₃
• [Mn²⁺₃][Al³⁺₂][(SiO₄)₃]^12-

• Class: Pyralspite subgroup < Garnet group < Garnet supergroup
• Class: Nesosilicate
• Insoluble in: HCl

• Mn => Fe: Almandine (Series)
• Mn => Mg: Pyrope (Series)
• Mn => Ca: Grossular

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

• Color: Red, Orange, Yellowish brown
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Habit: Tetracosahedron (High T), Dodecahedron (Low T)

• Cleavage: Distinct
• Hardness: 6.5-7.5
• Density: 4.2

• System: Cubic
• Group: m3m, Ia3d
• Lattice: a=11.6

Etymology: Spessart district, Germany