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Grossular (Photo) [abbr. Grs, Hbs, Hgr ]

Year of discovery: 1808 (Akhtaragda River mouth, Russia), 1891 (Japan)

Locality list: 265 localities of grossular

• Ca₃Al₂(SiO₄)₃
• [Ca²⁺₃][Al³⁺₂][(SiO₄)₃]^12-

• Class: Ugrandite subgroup < Garnet group < Garnet supergroup
• Class: Nesosilicate
• Variety: Hibschite (+OH)
• Variety: Hydrogrossular (+H₂O)
• Insoluble in: HCl
• Fluorescence: UV excitation (Rarely, Orange)

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

• Al => Fe: Andradite (Series)
• Al => V: Goldmanite
• Al => Cr: Uvarovite (Series)
• Al => (Ti,Fe): Morimotoite
• Al => Zr: Kimzeyite

• SiO₄ => (OH)₄: Katoite (Series)

• Color: Brown, White, Gray, Green
• Streak: White, Pale brown
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Habit: Tetracosahedral, Dodecahedral

• Cleavage: No, Parting on {110} (4 planes)
• Hardness: 6.5-7
• Density: 3.6

• System: Cubic
• Group: m3m, Ia3d
• Lattice: a=11.9

Synonym: Grossularite