Nickelhexahydrite

nickelhexahydrite

morenosite

talc

retgersite

Formula: Ni(SO₄).6H₂O
Hydrated sulphate, hexahydrite group, monoclinic paramorph of tetragonal retgersite
Crystal System: Monoclinic
Specific gravity: 2.036 measured, 2.05 calculated
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 31.5^oC 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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