Nickel

nickel

pentlandite

pyrrhotite

nepouite

Images

Formula: Ni
Native element, transition metal, iron group
Specific gravity: 8.90
Hardness: 4½
Streak: Greyish white
Colour: White, bright silver
Common impurities: Fe,Co
Melting point: 1455oC
Boiling point: 2990oC
Environments

Hydrothermal environments

Nickel occurs occasionally in the native state but is mainly found as compounds. Its chief ores are pentlandite, pyrrhotite, népouite-willemseite, millerite and nickeline.
Abundance is 84 parts per million by mass, 30 parts per million by moles in the Earth's crust, and 80 parts per million by mass, 2 parts per million by moles in the Solar System. Nickel is 100 times more concentrated in the Earth's core than in the Earth’s crust; it is believed to be the second most abundant element in the core, after iron, which is far more abundant.
In chemical combinations the oxidation number may be -1, 0, 4 or 2 (ChC).

In the native state nickel occurs in serpentinised ultramafic rocks as a result of low-temperature hydrothermal activity, associated with heazlewoodite, pyrite, pyrrhotite, pentlandite, godlevskite, orcelite, millerite, nickel, copper, chalcopyrite, chalcocite and galena (HOM).

Localities

At the type locality, Bogota, Canala Commune, Northern Province, New Caledonia, France, native occurs as euhedral grains and intergrown cubic crystals, up to 0.1 mm, within heazlewoodite in a low temperature hydrothermal environment in serpentinised ultramafic rocks. Associated minerals include pyrrhotite, pyrite, pentlandite, orcelite, millerite, heazlewoodite, godlevskite, galena, copper, chalcopyrite and chalcocite (Mindat)

Nickel-bearing minerals include:

Alloys
awaruite

Sulphides
gersdorffite
godlevskite
heazlewoodite
mackinawite
millerite
pentlandite
ullmannite
vaesite
violarite

Arsenides
krutovite
majakite
maucherite
nickeline
nickelskutterudite
orcelite
rammelsbergite
safflorite

Selenides
sederholmite
trüstedtite

Antimonides
breithauptite

Sulphosalts
hrabákite
tučekite

Hydroxides and Oxides
asbolane
bunsenite
theophrastite

Halogenides
gillardite

Carbonates
glaukosphaerite
otwayite
szymańskiite
zaratite

Sulphates
dwornikite
honessite
nickelhexahydrite
nickelzippeite
retgersite

Arsenates
aerugite
annabergite

Phyllosilicates
népouite
willemseite

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