Formula: NaCu2(SO4)2(OH).H2O
Origin of name: from composition natrium = sodium, chalkos = copper
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 8.33 Å, b = 6.16 Å, c = 7.44 Å, b = 112.9°
Colour: emerald-green
Diaphaneity:
Luster: vitreous
Habit: crystals pyramidal, crystalline crusts, cross-fiber veinlets
Hardness: 4.5
Specific gravity: 3.49
Cleavage: 1; {001} perfect
Tenacity: uneven, brittle
Streak: greenish white
Synonyms/varieties:
Comments:
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