maucherite


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maucherite

[′mau̇·chə‚rīt]
(mineralogy)
Ni11 As8 A reddish silver-white mineral composed of nickel arsenide.
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Outer surfaces of this "red nickel ore" may display garnierite-like alteration products, as well as matte-gray nickel-skutterudite; in addition, tiny, striated, tabular crystals of maucherite (<0.
See under Nickeline, Nickel-skutterudite and Maucherite.
1966) Maucherite, or et nickeline de la mine d'Aghbar, region de Bou-Azzer (Anti-Atlas).
Millerite, and the nickel arsenide maucherite, are closely associated with grossular and diopside in calcite-filled cavities; no paragenetic priority is apparent among the minerals in the cavities (Palache and Wood, 1904), suggesting they crystallized at, or about the same time.
Nickel, already present in the listwaenite and probably derived from the protolith serpentinite, was also mobilized, and with the addition of sulfur, arsenic and possibly more nickel, was reprecipitated as millerite and maucherite.
Sulfides Phosphates and Arsenopyrite(*) Arsenates Godlevskite(*) Annabergite(*) Maucherite Apatite group(*) Millerite Pentlandite(*) Silicates Albite(*) Oxides Allanite-(Ce)* Chromite Andradite(*) Magnetite(*) Clinochlore(*) Diopside Carbonates Epidote Calcite Grossular Dolomite Microcline(*) Pecoraite(*) Prehnite(*) Tremolite (*) Species whose occurrence at the Orford nickel mine is reported here for the first time.
Godievskite, maucherite, millerite and pentlandite occur in the same association.
The godlevskite/pentlandite crystals occur disseminated along with maucherite, millerite, clinochlore and chromite in a pale green, massive, fine-grained granular intergrowth of grossular and diopside impregnated with calcite.
A metallic mineral provisionally identified as "rammelsbergite" by Palache and Wood (1904) was subsequently shown to be maucherite (Peacock, 1940).
The maucherite occurs as single crystals and crystal clusters to 1 mm associated with green grossular, diopside and millerite in calcite; the crystals are revealed by etching the enclosing calcite.
The Orford nickel mine is the only known occurrence of distinct crystals of maucherite in Canada.
The color of the millerite is brass-yellow and is quite distinctive from the bronze-yellow color of maucherite.