Formula: Ni3Si2O5(OH)4
Origin of name: for W. Pecora, American geologist
Crystal system: monoclinic
Crystal class: unknown
Twinning:
Unit cell: a = 5.26 Å, b = 9.16 Å, c = 14.7 Å, b = 92°
Colour: green
Diaphaneity:
Luster: vitreous
Habit: grains, 0.1 to 1.5 mm
Hardness:
Specific gravity: 3.08
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments: dimorphous with nepouite, from a few localities and a meteorite
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