Formula: Mg6Cr2(OH)16Cl2·4H2O
Origin of name: for Roy Woodall (1930-), eminent Australian geologist who was instrumental in the initiation and development of the nickel and aluminium industries in Western Australia.
Crystal system: Trigonal
Crystal class: 3 2/m
Twinning:
Unit cell: a = 3.103, c = 24.111
Colour: Deep magenta, purple
Diaphaneity: Transparent
Luster: Resinous, waxy
Habit: Platy
Hardness: 1.5-2
Specific gravity: 2.06
Cleavage: {001} perfect
Tenacity: Brittle
Streak: Pale pinkish white
Synonyms/varieties:
Comments:
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