Hydrated sulphate, hexahydrite group, monoclinic paramorph of tetragonal retgersite
Specific gravity: 2.07
Colour: Bluish green
Common impurities: Mg,Fe
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
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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