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Takanelite

Year of discovery: 1964 (Japan as the first occurence in the World)

Locality list: 2 localities of takanelite

• MnMn₄O₉,H₂O
• (Mn²⁺, Ca)Mn⁴⁺₂O₉,H₂O
• [Mn²⁺][Mn⁴⁺₄][O₉]^18-,H₂O

• Class: Oxide

• Mn => Ca: Ranciéite (Series)

• Color: Gray, Black, Grayish brown
• Streak: Dark brown
• Luster: Sub-Metallic
• Diaphaneity: Opaque

• Cleavage: No
• Hardness: 5
• Density: 3.4

• System: Hexagonal
• Lattice: a=8.7, c=9.2

Etymology: Dr. Katsutoshi Takane (1899-1945), Japanese mineralogist of Tohoku University