Formula: Zn4Si2O7(OH)2 . H2O
Origin of name: From Greek hemi - half and morphe - form
Crystal system: Orthorhombic
Crystal class: mm2
Twinning: Rare on {001}
Unit cell: a = 8.370 Ǻ, b = 10.72 Ǻ, c = 5.120 Ǻ
Colour: White, colourless, pale blue, greenish, gray, yellowish, brown
Diaphaneity:
Luster: Vitreous
Habit: Crystals thin tabular, vertically striated, doubly terminated crystals distinctly hemimorphic, often fan-shaped groups
Hardness: 4.5 to 5
Specific gravity: 3.4 to 3.5
Cleavage: 3; {110} perfect, {101} imperfect, {001} traces
Tenacity: Subconchoidal to uneven, brittle
Streak: Colourless
Synonyms/varieties: Calamine, daviesite, wagite
Comments:
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