Formula: Na8Mn2Si10O25(OH,Cl)2.12H2O
Origin of name: after locality, Demix-Varennes quarry, which lies between the villages of Varennes and Saint-Amable, in Vercheres County, Quebec, Canada
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 13.447, b = 15.022, c = 17.601
Colour: Pale brownish yellow to orange
Diaphaneity: Translucent to transparent
Luster: Vitreous
Habit: Tabular crystals to 4 mm, euhedral
Hardness: 4
Specific gravity: 2.31
Cleavage: 1; {010} good
Tenacity: Brittle, conchoidal fracture
Streak: White
Synonyms/varieties:
Comments:
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