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Nickelblödite

Nickelblödite
A crust of greenish nickelblödite on gossan; obtained from dealer at the Minerant (mineral show of the MKA) 2016
General
CategorySulfate mineral
FormulaNa2Ni(SO4)2·4H2O
IMA symbolNblö[1]
Strunz classification7.CC.50
Dana classification29.3.3.2
Crystal systemMonoclinic
Crystal classPrismatic (2/m)
(same H-M symbol)
Space groupP21/a
Unit cella = 10.87, b = 8.07
c = 5.46 [Å]; β = 100.43°; Z = 2
Identification
ColorPale yellowish-green to pale green
Crystal habitFlat crystallites
DiaphaneityTranslucent
Specific gravity2.43 (calculated)
Optical propertiesBiaxal (-)
Refractive indexnα=1.50-1.51, nβ=1.51-1.52, nγ=1.51-1.52 (approximated)
Common impuritiesMg, Fe
References[2][3][4]

Nickelblödite is a rare nickel sulfate mineral with the formula Na2Ni(SO4)2·4H2O.[2][4] Nickelblödite was discovered in nickel mines in Carr Boyd Rocks and Kambalda, Western Australia.[2] The mineral is a nickel-analogue of blödite, changoite, cobaltoblödite and manganoblödite - other representatives of the blödite group.[4]

Nickelblödite contains small admixtures of magnesium and iron.[3]

Minerals associating with nickelblödite include violarite, morenosite, halite, pyrite, and siderite.[3]

Features

Nickelblodite is a sulfate of the chemical formula Na2Ni(SO4)2·4H2O. It crystallizes in the monoclinic system. It is usually found in the form of flat crystals, up to 150 microns, with soft shapes probably rounded by the solution, and in efflorescence. According to the Nickel-Strunz classification, nickelblödite belongs to "07.C - Sulfates (selenates, etc.) without additional anions, with H2O, with medium and large cations".

Formation and deposits

This mineral has been identified from specimens collected in two different locations in Western Australia: the Kambalda nickel mine in Coolgardie, and the Carr Boyd Rocks nickel mine in Menzies. It has only been described in two other places around the world: the sulfate deposit of Sohland an der Spree, in Upper Lusatia, Germany and the Km-3 mine in Lavrio, Greece.

References

  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ a b c Nickel, E.W., and Bridge, P.J., 1977. Nickelblödite, Na2Ni(SO4)2·4H2O, a new mineral from Western Australia. Mineralogical Magazine 41, 37-41
  3. ^ a b c "Nickelblödite - Handbook of Mineralogy" (PDF). Handbookofmineralogy.org. Retrieved 2016-03-11.
  4. ^ a b c "Nickelblödite: Nickelblödite mineral information and data". Mindat.org. Retrieved 2016-03-11.

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