Formula: Cu4(SO4)(OH)6.H2O
Origin of name: for E. Posnjak, Russian-American geochemist
Crystal system: monoclinic
Crystal class: m
Twinning:
Unit cell: a = 14.24 Å, b = 6.34 Å, c = 10.57 Å, b = 102.9°
Colour: blue to dark blue
Diaphaneity:
Luster: vitreous
Habit: crystals tabular, to 0.2 to 0.5 mm, small grains, thin films
Hardness: 2 to 3
Specific gravity: 3.35
Cleavage: none
Tenacity:
Streak: bluish
Synonyms/varieties:
Comments:
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