Formula: Ni(OH)2
Origin of name: for Theophrastus (ca 371-286 BCE), Greek philosopher and writer, disciple of Aristotle. Author in 315 BCE of perhaps the first mineralogy textbook.
Crystal system: Hexagonal
Crystal class: 3 2/m
Twinning:
Unit cell: a = 3.131, c = 4.608
Colour: Emerald green
Diaphaneity: Transparent
Luster: Vitreous
Habit: Crystals smaller than 1 mm, crusts smaller than 5 mm
Hardness: 3.5
Specific gravity: 4.0
Cleavage: 1; basal, perfect
Tenacity: Conchoidal fracture
Streak: Pale green
Synonyms/varieties:
Comments:
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