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Hydroxylchondrodite

Year of discovery: 2010 (Perovskitovaya mine, Russia)

Locality list:

• Mg₅(SiO₄)₂(OH)₂
• (Mg²⁺)₅(SiO₄)₂(OH,F)₂
• [Mg²⁺₅][(OH)₂|(SiO₄)₂]

• Class: Humite group
• Class: Nesosilicate - Hydroxide

• Mg => Mn: Alleghanyite (Monoclinic), Ribbeite (Orthorhombic)
• Mg => Ca: Reinhardbraunsite

• OH => F: Chondrodite

• Color: Reddish brown
• Streak: Pale reddish brown, White
• Luster: Vitreous
• Diaphaneity: Translucent

• Cleavage: Parting on {001} (1 plane)
• Hardness: 6
• Density: 3.2

• System: Monoclinic
• Group: 2/m, P2₁/b
• Lattice: a=7.9, b=4.7, c=10.3, β=109.2