Mineralpedia Details for Nickelhexahydrite

Named as being the nickel-rich analogue of hexahydrite. An uncommon mineral, Nickelhexahydrite occurs as a precipitate from mine waters in open pit nickel miners as well as in oxidized zones of nickel-bearing rocks. It additionally forms in shear zones in talc with associated ultramafic rocks and can be formed from water solutions of less than 31.5 degrees Celsius. It occurs in localities in Russia, Finland, Switzerland, Bosnia-Herzegovina, the Czech Republic, Germany, and Australia. Nickelhexahydrite is soluble in water.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/nickelhexahydrite.pdf

Formula

NiSO₄·6H₂O 

Crystal System

Monoclinic 

Cleavage

Perfect, Good, None 

Luster

Vitreous (Glassy) 

Color

bluish green 

Streak

white 

Class

Monoclinic - Prismatic 

Hardness

2 

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Translucent green, glassy, crusts with no definite crystal forms probably a efflorescent growth on matrix. Found at the deepest parts of the mine.