Formula: Ca(Cu,Zn)4(SO4)2(OH)6.3H2O
Origin of name: for G. Serpieri, Italian engineer
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 22.19 Å, b = 6.25 Å, c = 21.85 Å, b = 113.4°
Colour: sky-blue
Diaphaneity:
Luster: vitreous, pearly on cleavage
Habit: crystals lath-like, minute, tufts, crusts, rounded masses
Hardness:
Specific gravity: 3.07
Cleavage: 1; {001} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments: dimorphous with orthoserpierite
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