Formula: Ni3Si2O5(OH)4
Origin of name: after locality Nepoui, New Caledonia
Crystal system: orthorhombic
Crystal class: mmm
Twinning:
Unit cell: a = 5.31 Å, b = 9.17 Å, c = 7.26 Å
Colour: green
Diaphaneity:
Luster:
Habit: massive
Hardness: 1
Specific gravity: 3.20
Cleavage: 1; basal, perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments: series with lizardite, dimorphous with pecoraite
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