Nickelhexahydrite Mineral Data

Nickelhexahydrite Mineral Data +

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General Nickelhexahydrite Information

Chemical Formula:

(Ni,Mg,Fe++)(SO4)·6(H2O)

Composition:

Molecular Weight = 252.25 gm

Magnesium 2.89 % Mg 4.79 % MgO

Iron 2.21 % Fe 2.85 % FeO

Nickel 13.96 % Ni 17.77 % NiO

Hydrogen 4.80 % H 42.85 % H₂O

Sulfur 12.71 % S 31.74 % SO₃

Oxygen 63.43 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ni_0.6Mg_0.3Fe²⁺_0.1(SO₄)·6(H₂O)

Environment:

Secondary mineral in nickel-bearing sulfide ores.

IMA Status:

Approved IMA 1965

Locality:

Severnaya mine, Norilsk, Siberia, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for nickel in the compostion and relationship to hexahydrite.

Synonym:

ICSD 65018

PDF 33-955

Nickelhexahydrite Image

Images:

Nickelhexahydrite

Comments: Pale greenish crust of ferroan nickelhexahydrite.
Location: Sohland, Bautzen, Oberlausitz, Saxony, Germany. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Nickelhexahydrite Crystallography

Axial Ratios:

a:b:c =1.3723:1:3.3472

Cell Dimensions:

a = 9.84, b = 7.17, c = 24, Z = 8; beta = 97.5° V = 1,678.78 Den(Calc)= 2.00

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 4.35(1), 2.89(0.9), 3.98(0.9),

Physical Properties of Nickelhexahydrite

Cleavage:

[010] Perfect, [100] Good

Color:

Bluish green.

Density:

2.07

Diaphaniety:

Transparent to Translucent

Hardness:

2 - Gypsum

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Nickelhexahydrite

Gladstone-Dale:

CI meas= 0.062 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.03 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2408,KPDmeas= 0.2326,KC= 0.2481

Optical Data:

Biaxial (?), a=1.469-1.47, g=1.493-1.494, bire=0.0240

Calculated Properties of Nickelhexahydrite

Electron Density:

r_electron=2.08 gm/cc
note: r_{Nickelhexahydrite}=2.00 gm/cc.

Fermion Index

Fermion Index = 0.0062
Boson Index = 0.9938

Photoelectric:

PE_{Nickelhexahydrite}= 6.80 barns/electron
U=PE_{Nickelhexahydrite} x r_electron= 14.12 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Nickelhexahydrite is Not Radioactive

Nickelhexahydrite Classification

Dana Class:

29.6.8.4 (29)Hydrated Acid and Sulfates

(29.6)where A XO4 · x(H2O)

(29.6.8)Hexahydrite Group (Space Group: C2/c)

29.6.8.1 Hexahydrite MgSO4·6(H2O) A2/a 2/m

29.6.8.2 Bianchite (Zn,Fe)(SO4)·6(H2O) C 2/c 2/m

29.6.8.3 Ferrohexahydrite FeSO4·6(H2O) C 2/c 2/m

29.6.8.4 Nickelhexahydrite (Ni,Mg,Fe)(SO4)·6(H2O) C 2/c 2/m

29.6.8.5 Moorhouseite (Co,Ni,Mn)SO4·6(H2O) C 2/c 2/m

29.6.8.6 Chvaleticeite (Mn,Mg)SO4·6(H2O) C 2/c 2/m

Strunz Class:

VI/C.05-50 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/C - Water-bearing sulfates without unfamiliar anions. cations of medium size

VI/C.05 - Hexahydrite group

VI/C.05-10 Hexahydrite MgSO4·6(H2O) A2/a 2/m

VI/C.05-20 Ferrohexahydrite FeSO4·6(H2O) C 2/c 2/m

VI/C.05-30 Chvaleticeite (Mn,Mg)SO4·6(H2O) C 2/c 2/m

VI/C.05-40 Moorhouseite (Co,Ni,Mn)SO4·6(H2O) C 2/c 2/m

VI/C.05-50 Nickelhexahydrite (Ni,Mg,Fe)(SO4)·6(H2O) C 2/c 2/m

VI/C.05-60 Bianchite (Zn,Fe)(SO4)·6(H2O) C 2/c 2/m

VI/C.05-70 Retgersite NiSO4·6(H2O) P 4₁2₁2,P 4₃2₁2 4 2 2

Other Nickelhexahydrite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Nickelhexahydrite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Print or Cut-and-Paste your Nickelhexahydrite Specimen Label here :

Nickelhexahydrite

(Ni,Mg,Fe++)(SO4)·6(H2O)
Dana No: 29.6.8.4 Strunz No: VI/C.05-50
Locality:

Notes: