Formula: Mn5(OH)4(VO4)2
Origin of name: after locality Reppia, Italy
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: orange-red
Diaphaneity: transparent
Luster: vitreous
Habit: aggregates of minute tabular crystals to 5o by 300 micron
Hardness: 2.5 to 3
Specific gravity: 3.92
Cleavage: none
Tenacity:
Streak: orange-yellow
Synonyms/varieties:
Comments:
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