Formula: (Mn,Mg)5Si8O20(OH)2.8-9H2O
Origin of name: for Yves Oscar Fortier (1914-), formater Director of the Geological Survey of Canada (1964-1972).
Crystal system: Monoclinic
Crystal class: m
Twinning:
Unit cell: a = 12.759, b = 18.369, c = 5.024, β = 94.98°
Colour: Pink to violet, light violet, violet brown
Diaphaneity: Transparent
Luster: Silky, dull
Habit: radiating fibers to 3 cm, acicular
Hardness: 2.5
Specific gravity: 2.18
Cleavage:
Tenacity: Elastic
Streak: Light pink
Synonyms/varieties:
Comments:
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