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Ribbeite

Year of discovery: 1987 (Kombat mine, Namibia), 1991 (Japan)

Locality list: 31 localities of ribbeite

• Mn₅(SiO₄)₂(OH)₂
• (Mn,Mg)₅(SiO₄)₂(OH)₂
• [Mn²⁺₅][(OH)₂|(SiO₄)₂]^10-

• Class: Humite group
• Class: Nesosilicate - Hydroxide

• Polymorph: Alleghanyite (Monoclinic)

• Mn => Ca: Reinhardbraunsite
• Mn => Mg: Hydroxylchondrodite

• Color: Pink
• Streak: Pale pink
• Luster: Vitreous
• Diaphaneity: Transparent

• Cleavage: No
• Hardness: 5
• Density: 3.9

• System: Orthorhomic
• Group: mmm, Pnma
• Lattice: a=4.8, b=10.7, c=15.7