Nickelhexahydrite

minerals

morenosite

talc

retgersite

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

Hydrothermal 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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