Formula: α-AlO(OH)
Origin of name: From Greek for to scatter
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: White to colourless, yellowish, greenish, lilac, pink, brownish
Diaphaneity: Transparent to subtranslucent
Luster: Vitreous, pearly on cleavages
Habit: Crystals thin elongated plates; acicular or tabular, striated; massive, foliated, scaly, stalactitic
Hardness: 6.5 to 7
Specific gravity: 3.3 to 3.5
Cleavage: 3; {010} perfect, {110} distinct, {100} traces
Tenacity:
Streak:
Synonyms/varieties:
Comments: Dimorphous with boehmite
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