Formula: Cu2Mg2(PO4)2(OH)2.5H2O
Origin of name: for W. Nisson, American amateur mineralogist
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 22.523, b = 5.015, c = 10.506, β = 99.62°
Colour: bluish green
Diaphaneity:
Luster:
Habit: crystals tabular, elongated or diamond-shaped, minute, in aggregates, thin crusts
Hardness: 2.5
Specific gravity: 2.73
Cleavage: 1; {100} fair/distinct
Tenacity:
Streak: Light green
Synonyms/varieties:
Comments:
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