Formula: (Mn,Fe)8Si6O15(OH)8Cl2
Origin of name: For McGill University, Quebec, Canada
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Light to dark pink
Diaphaneity:
Luster: Pearly
Habit: Massive
Hardness: 4 to 4.5
Specific gravity: 2.98
Cleavage: 2; {0001} good, easy, {10-11} difficult
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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