Formula: Cu3Zn(OH)6Cl2
Origin of name: for G.F. Herbert Smith (1872–1953), British Museum (Natural History)
Crystal system: Trigonal
Crystal class: -3 2/m
Twinning:
Unit cell: a = 5.47, b = 2.764, c =2.266
Colour: Dark green to blue-green
Diaphaneity: Transparent
Luster: Vitreous
Habit: Platy, pseudohexagonal crystals, rhombohedrons
Hardness: 3-3.5
Specific gravity: 3.85-3.95
Cleavage: {10_11} distinct/good
Tenacity: Brittle
Streak: Light green
Synonyms/varieties:
Comments:
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