Serpierite

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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