Formula: Zn4(PO4)2(OH)2.3H2O
Origin of name: for L. Spencer, English mineralogist
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: white
Diaphaneity:
Luster: vitreous, pearly on cleavages
Habit: crystals tabular, striated, massive, stalactitic, platy to columnar
Hardness: 3
Specific gravity: 3.15
Cleavage: 3; {100} perfect, {010} good, {001} distinct
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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