Formula: (Na,K)2Mg(Si,Al)18O36(OH) . 9H2O
Origin of name: For W. Ferrier, Canadian geologist
Crystal system: Orthorhombic and monoclinic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 19.17 Ǻ, b = 14.10 Ǻ, c = 7.495 Ǻ
Colour: Colourless, white
Diaphaneity:
Luster: Vitreous to pearly
Habit: Crystals thin tabular, in radiating groups; monoclinic variety has diamond-shaped cross section
Hardness: 3 to 3.5
Specific gravity: 2.14
Cleavage: 1; {100} perfect
Tenacity:
Streak: White
Synonyms/varieties:
Comments: Monoclinic type uncommon
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