Népouite

nepouite

talmessite

nickeline

chlorite

Images

Formula: Ni₃Si₂O₅(OH)₄
Phyllosilicate (sheet silicate), serpentine subgroup, forms a series with lizardite, orthorhombic paramorph of monoclinic pecoraite, nickel-bearing mineral
Specific gravity: 3.24
Hardness: 2 to 2½
Streak: Greenish white
Colour: Intense dark green to dull green
Environments

Hydrothermal environments

Localities

At the type locality, the Népoui mine, Poya North Commune, Northern Province, New Caledonia, France, népouite occurs as an alteration product of nickel-rich ultramafic rocks. Associated minerals include serpentine and chlorite (Mindat)

In Vein No. 51, Aït Ahmane, Agdz Cercle, Zagora Province, Drâa-Tafilalet Region, Morocco, nickel-rich talmessite forms pale green crusts and tiny crystals on calcite matrix, with nickeline and emerald-green népouite (Minrec 38.5.384).

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