Formula: Ni(SO4).6H2O
Hydrated sulphate, hexahydrite group, monoclinic
paramorph of tetragonal
retgersite
Specific gravity: 2.07
Hardness: 2
Streak: White
Colour: Bluish green
Common impurities: Mg,Fe
Environments
Nickelhexahydrite occurs as a secondary mineral in
nickel-bearing sulphide ores (Webmin). It is formed
from aqueous solutions below 31.5oC and associated with morenosite
(HOM).
Localities
At the Lahnaslampi deposit, Finland, nickelhexahydrite occurs in shear zones in
talc overlying ultramafic rocks
(HOM).
At the Severnaya mine, Noril'sk, Putoran Plateau, Taimyr Peninsula, Taymyrskiy Autonomous Okrug,
Krasnoyarsk Krai, Russia, nickelhexahydrite is precipitated from mine waters in the bottom of an open-pit
nickel mine, and on nickel-bearing
gabbro-dolerite rocks in
the oxidation zone
(HOM).
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