Formula: Al(OH)3
Origin of name: for R. Van Nordstrand, American scientist
Crystal system: triclinic
Crystal class: -1
Twinning:
Unit cell:
Colour: colourless, beige, pink, pale green
Diaphaneity:
Luster: vitreous, pearly on cleavage
Habit: crystals tabular or blocky, in spherules and sheaf-like aggregates
Hardness: 3
Specific gravity: 2.42
Cleavage: 1; {110} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments: polymorphous with bayerite, doyleite and gibbsite
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