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Okhotskite

Year of discovery: 1987 (Japan as the first occurence in the World)

Locality list: 10 localities of okhotskite

• Ca₂Mn₃Si₃O₁₁(OH)₂,H₂O
• Ca₂(Mn,Mg)(Mn,Al,Fe)₂Si₃O₁₁(OH,O)₂,H₂O
• [Ca²⁺₂][Mn²⁺][Mn³⁺₂][(OH)₂|SiO₄|Si₂O₇]^12-,H₂O

• Class: Pumpellyite group
• Class: Sorosilicate - Nesosilicate - Hydroxide - Hydrate

• Mn3+ => Al: Pumpellyite-(Mn)

• Mn => Fe: Julgoldite-(Fe2+)

• Mn₃(OH) => Al₃O: Pumpellyite-(Al) (Series)
• Mn₃(OH) => Fe₃O: Julgoldite-(Fe3+)
• Mn₃(OH) => V₃O: Poppiite

• Color: Orange
• Streak: Pale orange
• Luster: Vitreous
• Diaphaneity: Transparent

• Habit: Long prismatic

• Cleavage: Distinct
• Hardness: 6

• System: Monoclinic
• Group: 2/m, A2/m
• Lattice: a=8.9, b=6.0, c=19.5, β=97.1

Etymology: The Sea of Okhotsku near Kokuriki mine in Hokkaido, Japan, where this mineral was discovered for the first time.

Synonym: Okhotskite-(Mn2+)