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Ranciéite (Photo), Rancieite

Year of discovery: 1859 (Le Rancié mine, France), 1957 (Japan)

Locality list: 15 localities of ranciéite

• CaMn₄O₉,3H₂O
• (Ca,Mn²⁺)Mn⁴⁺₂O₉,3H₂O
• [Ca²⁺][Mn⁴⁺₄][O₉]^18-,3H₂O

• Class: Oxide

• Ca => Mn: Takanelite (Series)

• Color: Brown, Purplish brown, Black
• Streak: Dark brown
• Luster: Metallic
• Diaphaneity: Translucent-Opaque

• Habit: Thin platy

• Cleavage: No
• Hardness: 2.5-3
• Density: 3.2

• System: Trigonal
• Group: (-3), P(-3)
• Lattice: a=2.5, c=7.5