Formula: (Ca,Mn)Mn4O9.3H2O
Origin of name: after locality Rancie, Ariege, France
Crystal system: hexagonal
Crystal class: unknown
Twinning:
Unit cell:
Colour: black, brownish, silver-gray
Diaphaneity: transparent in thin fragments
Luster: bright metallic
Habit: massive, fine lamellar
Hardness:
Specific gravity: 3.2 to 3.3
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments: series with takanelite
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