Nickelhexahydrite Mineral Data

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.

Name Pronunciation:

Nickelhexahydrite

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 - Prismatic H-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

Diaphaneity:

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
Ncalc = 1.5 - 1.51

Optical Data:

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

Calculated Properties of Nickelhexahydrite

Electron Density:

Bulk Density (Electron Density)=2.08 gm/cc
note: Specific Gravity of Nickelhexahydrite =2.00 gm/cc.

Fermion Index:

Fermion Index = 0.00620257
Boson Index = 0.99379743

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Nickelhexahydrite is Not Radioactive

Nickelhexahydrite Classification

Dana Class:

29.06.08.04 (29)Hydrated Acid and Sulfates

(29.06)where A XO4 ï¿½ x(H2O)

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

29.06.08.01 Hexahydrite MgSO4•6(H2O) A2/a 2/m

29.06.08.02 Bianchite (Zn,Fe)(SO4)•6(H2O) C 2/c 2/m

29.06.08.03 Ferrohexahydrite FeSO4•6(H2O) C 2/c 2/m

29.06.08.04 Nickelhexahydrite (Ni,Mg,Fe)(SO4)•6(H2O) C 2/c 2/m

29.06.08.05 Moorhouseite (Co,Ni,Mn)SO4•6(H2O) C 2/c 2/m

29.06.08.06 Chvaleticeite (Mn,Mg)SO4•6(H2O) C 2/c 2/m

Strunz Class:

07.CB.25 07 - SULFATES (SELENATES, TELLURATES)

07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O

07.CB -With only medium-sized cations

07.CB.25 Bianchite (Zn,Fe)(SO4)•6(H2O) C 2/c 2/m

07.CB.25 Ferrohexahydrite FeSO4•6(H2O) C 2/c 2/m

07.CB.25 Chvaleticeite (Mn,Mg)SO4•6(H2O) C 2/c 2/m

07.CB.25 Hexahydrite MgSO4•6(H2O) A2/a 2/m

07.CB.25 Moorhouseite (Co,Ni,Mn)SO4•6(H2O) C 2/c 2/m

07.CB.25 Nickelhexahydrite (Ni,Mg,Fe)(SO4)•6(H2O) C 2/c 2/m

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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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

Nickelhexahydrite

(Ni,Mg,Fe++)(SO4)•6(H2O)
Dana No: 29.06.08.04 Strunz No: 07.CB.25
Locality:

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