Formula: (Ba,H2O)Mn5O10
Origin of name: after locality Romanèche, Saone-et-Loire, France
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: black to steel-gray
Diaphaneity: opaque
Luster: submetallic, dull
Habit: massive, botryoidal, reniform, stalactitic, earthy, pulverulent
Hardness: 5 to 6
Specific gravity: 6.45
Cleavage: none
Tenacity:
Streak: brownish black to black
Synonyms/varieties:
Comments:
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