Dwornikite Mineral Data

Dwornikite Mineral Data +

General Dwornikite Information

Chemical Formula:

(Ni,Fe++)SO4·(H2O)

Composition:

Molecular Weight = 172.06 gm

Iron 8.11 % Fe 10.44 % FeO

Nickel 25.58 % Ni 32.56 % NiO

Hydrogen 1.17 % H 10.47 % H₂O

Sulfur 18.64 % S 46.53 % SO₃

Oxygen 46.49 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ni_0.75Fe²⁺_0.25(SO₄)·(H₂O)

IMA Status:

Approved IMA 1981

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 71347

PDF 21-974

Dwornikite Image

Images:

Dwornikite

Comments: Green earthy, powdery dwornikite on or replacing millerite as acicular crystals in 1cm vug.
Location: Lipovka Ni deposit, Rezh District, Central Urals, Urals Region, Russia. Scale: Picture size 1.2 cm.
© Tom Loomis / Dakota Matrix

Dwornikite Crystallography

Axial Ratios:

a:b:c =0.902:1:0.9857

Cell Dimensions:

a = 6.839, b = 7.582, c = 7.474, Z = 4; beta = 117.85° V = 342.66 Den(Calc)= 3.33

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): 3.342(1), 4.732(1), 3.024(0.7),

Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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H - Help Screen
I - Data Info
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Wildner M , Giester G , Neues Jahrbuch fur Mineralogie, Monatshefte , 1991 (1991) p.296-306, The crystal structures of kieserite-type compounds., I. Crystal structures of Me(II)SO4*H2O (Me = Mn,Fe,Co,Ni,Zn), Locality: synthetic

Physical Properties of Dwornikite

Color:

White.

Density:

3.34

Diaphaniety:

Transparent to Translucent

Hardness:

2-3 - Gypsum-Calcite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Dwornikite

Gladstone-Dale:

CI meas= 0.032 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.029 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1892,KPDmeas= 0.1886,KC= 0.1949

Optical Data:

Biaxial (?), b=1.63

Calculated Properties of Dwornikite

Electron Density:

r_electron=3.31 gm/cc
note: r_Dwornikite=3.33 gm/cc.

Fermion Index

Fermion Index = 0.00623
Boson Index = 0.99377

Photoelectric:

PE_Dwornikite= 13.53 barns/electron
U=PE_Dwornikite x r_electron= 44.79 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Dwornikite is Not Radioactive

Dwornikite Classification

Dana Class:

29.6.2.6 (29)Hydrated Acid and Sulfates

(29.6)where A XO4 · x(H2O)

(29.6.2)Kieserite Group (Mono-hydrates)

29.6.2.1 Kieserite MgSO4·(H2O) C 2/c 2/m

29.6.2.2 Szomolnokite FeSO4·(H2O) A2/a 2/m

29.6.2.3 Szmikite MnSO4·(H2O) A2/a 2/m

29.6.2.4 Poitevinite (Cu,Fe,Zn)SO4·(H2O) P1 1

29.6.2.5 Gunningite (Zn,Mn)SO4·(H2O) A2/a 2/m

29.6.2.6 Dwornikite (Ni,Fe)SO4·(H2O) C 2/c 2/m

29.6.2.7 Cobaltkieserite! CoSO4·H2O C 2/c 2/m

Strunz Class:

VI/C.01-40 VI - Sulfates,Chromates,Molybdates and Tungstates

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

VI/C.01 - Kieserite group

VI/C.01-10 Kieserite MgSO4·(H2O) C 2/c 2/m

VI/C.01-20 Szomolnokite FeSO4·(H2O) A2/a 2/m

VI/C.01-30 Szmikite MnSO4·(H2O) A2/a 2/m

VI/C.01-35 Cobaltkieserite! CoSO4·H2O C 2/c 2/m

VI/C.01-40 Dwornikite (Ni,Fe)SO4·(H2O) C 2/c 2/m

VI/C.01-50 Poitevinite (Cu,Fe,Zn)SO4·(H2O) P1 1

VI/C.01-60 Gunningite (Zn,Mn)SO4·(H2O) A2/a 2/m

VI/C.01-70 Sanderite MgSO4·2(H2O) Mono ? Mono

Other Dwornikite Information

References:

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

See Also:

Links to other databases for Dwornikite :
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 - WWW-MINCRYST 13 -École des Mines de Paris

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Dwornikite

(Ni,Fe++)SO4·(H2O)
Dana No: 29.6.2.6 Strunz No: VI/C.01-40
Locality:

Notes: