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Sonolite

Year of discovery: 1962 (Japan as the first occurence in the World)

Locality list: 44 localities of sonolite

• Mn₉(SiO₄)₄(OH)₂
• Mn₉(SiO₄)₄(OH,F)₂
• [Mn²⁺₉][(OH)₂|(SiO₄)₄]^18-

• Class: Humite group
• Class: Nesosilicate - Hydroxide

• Polymorph: Jerrygibbsite (Orthorhombic)

• Mn => Mg: Hydroxylclinohumite

• Color: Dark brown, Pink, Orange
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Habit: Short prismatic
• Aggregate: Massive

• Cleavage: Indistinct
• Hardness: 5.5
• Density: 3.8

• System: Monoclinic
• Group: 2/m, P2₁/a
• Lattice: a=4.9, b=10.7, c=14.3, β=100.3

Etymology: Sono Mine in Kyoto prefecture, Japan, where this mineral was discovered for the first time.