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MINERALS INDEX
Niccolite |
| NiAs |
| Hexagonal |
Niccolite, in rough pyramidal crystals and granular aggregates, was found in the mass of nickel-cobalt ores cut by the Trotter shaft added depth of 340 feet. It was about equally abundant with chloanthite. (See page 31.) Several hundred pounds of these two minerals are said to have been contained in this mass. Where in contact with calcite or fluorite some of the niccolite is in rude crystals. Many of these are cavernous, being partly or wholly replaced by a green or gray nickeliferous silicate called desaulesite (see page 119), which is probably derived from the niccolite.
Chloanthite commonly forms of zone about isolated specks of niccolite in calcite. Most of the niccolite seen in specimens is compact and massive. It has not been analyzed. Koenig (137), who first noted its occurrence, received specimens in which were mere traces of niccolite; the larger masses of it were found later.
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© by Herb Yeates 1997-2001.
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page created: January 12, 2001 6:42 PM
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