Formula: Na3(Ca,Mn)2(CO3)3F
Origin of name: after locality Rouville County (Mont St.-Hilaire), Canada
Crystal system: monoclinic
Crystal class: m
Twinning:
Unit cell:
Colour: pale tan to colourless
Diaphaneity: transparent
Luster: vitreous to slightly waxy
Habit: irregular crystalline masses to 3 mm, rare crystals to 1 mm
Hardness: 3
Specific gravity: 2.67
Cleavage: 2; {001} good, {010} imperfect
Tenacity:
Streak: white
Synonyms/varieties:
Comments:
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