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Andradite (Photo) [abbr. Adr ]

Year of discovery: 1868 (Drammen, Norway), 1894 (Japan)

Locality list: 208 localities of andradite

• Ca₃Fe₂Si₃O₁₂
• [Ca²⁺₃][Fe³⁺₂][(SiO₄)₃]^12-

• Class: Ugrandite subgroup < Garnet group < Garnet supergroup
• Class: Nesosilicate
• Soluble in: HCl
• Magnetism: Paramagnetic (Weak)
• Variety: Melanite (+Ti)
• Variety: Hydroandradite (+H₂O)

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

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

• Fe³⁺Si⁴⁺ => Ti⁴⁺Fe³⁺: Schorlomite (Series)
• Fe³⁺Si⁴⁺ => Zr⁴⁺Al³⁺: Kimzeyite

• Color: Yellow, Green, Brown
• Streak: White
• Luster: Adamantine
• Diaphaneity: Transparent-Translucent

• Habit: Granular, Dodecahedron

• Cleavage: No
• Hardness: 7
• Density: 3.9

• System: Cubic
• Group: m3m, Ia3d
• Lattice: a=12.1

Etymology: J.B.Andrada, Portuguese mineralogist