rammelsbergite


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rammelsbergite

[′ram·əlz‚bər‚gīt]
(mineralogy)
NiAs2 A gray mineral composed of nickel diarsenide; it is dimorphous with pararammelsbergite. Also known as white nickel.
References in periodicals archive ?
The Tynebottom mine has produced an interesting suite of nickel and cobalt-containing minerals including erythrite, safflorite, nickel-skullerudite, violarite, rammelsbergite, annabergite, and some very attractive specimens of drusy calcite and "flowstone" colored pink to deep magenta by micro-inclusions of erythrite, or blue by copper salts.
Dull metallic gray reniform coatings of rammelsbergite (named for the ancient Rammelsberg mine in the German Harz) cover matrix plates of massive rammelsbergite.
Specimens showing apple-green annabergite crystals to 5 mm, as beautiful fan-shaped groups, were recovered in 1965; the specimens were found in a dolomitic cavity zone with nickeline, rammelsbergite and gersdorffite, at a depth of about 30 meters.
In Vein 51 at Ait Ahmane, in the eastern part of the district, a shear zone in serpentinite containing chalcopyrite, nickeline and rammelsbergite is especially rich in finely divided gold (particles <0.
Many of them occur only in microscopic sizes (siegenite, rammelsbergite, linnaeite, lautite, tennantite) and most are uncolorful (galena, sphalerite, molybdenite, millerite, chalcocite), unlike the secondary minerals such as malachite, azurite and cyanotrichite.
Apart from the classical Gabbe-Gottes and Saint-Louis mine wire silver, there were many other rare silver minerals: a fluckite with picropharmacolite, a good rammelsbergite, and also an exceptional prismatic proustite crystal to 1.
Associated primary metallic ores are massive and disseminated cobalt and nickel arsenides (mostly clinosafflorite and rammelsbergite, identified by X-ray diffraction and electron microprobe analysis) and copper sulfides (mostly chalcocite) in a gangue of dolomite, coarse tabular barite and calcite.