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Romanèchite, Romanechite

Year of discovery: 1910 (Romanèche-Thorens, France), 1959 (Japan)

Locality list: 12 localities of romanèchite

• Ba₂Mn₅O₁₀
• (Ba,H₂O)₂(Mn⁴⁺,Mn³⁺)₅O₁₀
• [Ba²⁺₂][Mn⁴⁺][Mn³⁺₄][O₁₀]^20-

• Class: Oxide

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

• Habit: Dendritic, Massive

• Cleavage: No
• Hardness: 5-6
• Density: 6.4

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=13.9, b=2.8, c=9.7, β=92.4