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)

Environment:

In a vanadium sulfide deposit, probably by oxidation of associated bravoite.

IMA Status:

Approved IMA 1981

Locality:

Minasragra, 46 km from Cerro de Pasco, Peru. Link to MinDat.org Location Data.

Name Origin:

Named for Edward J. Dwornik (1920- ), Lunar geologist and mineralogist, U.S. Geological Survey, Washington, D.C., USA,

Name Pronunciation:

Dwornikite + Pronunciation

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 - Prismatic H-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),

Physical Properties of Dwornikite

Color:

White.

Density:

3.34

Diaphaneity:

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
Ncalc = 1.65

Optical Data:

Biaxial (?), b=1.63

Calculated Properties of Dwornikite

Electron Density:

Bulk Density (Electron Density)=3.31 gm/cc
note: Specific Gravity of Dwornikite =3.33 gm/cc.

Fermion Index:

Fermion Index = 0.0062338396
Boson Index = 0.9937661604

Photoelectric:

PE_Dwornikite= 13.53 barns/electron
U=PE_Dwornikite x rElectron Density= 44.79 barns/cc.

Radioactivity:

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

Dwornikite Classification

Dana Class:

29.06.02.06 (29)Hydrated Acid and Sulfates

(29.06)where A XO4 ï¿½ x(H2O)

(29.06.02)Kieserite Group (Mono-hydrates)

29.06.02.01 Kieserite MgSO4•(H2O) C 2/c 2/m

29.06.02.02 Szomolnokite FeSO4•(H2O) A2/a 2/m

29.06.02.03 Szmikite MnSO4•(H2O) A2/a 2/m

29.06.02.04 Poitevinite (Cu,Fe,Zn)SO4•(H2O) P1 1

29.06.02.05 Gunningite (Zn,Mn)SO4•(H2O) A2/a 2/m

29.06.02.06 Dwornikite (Ni,Fe)SO4•(H2O) C 2/c 2/m

29.06.02.07 Cobaltkieserite! CoSO4•H2O C 2/c 2/m

Strunz Class:

07.CB.05 07 - SULFATES (SELENATES, TELLURATES)

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

07.CB -With only medium-sized cations

07.CB.05 Gunningite (Zn,Mn)SO4•(H2O) A2/a 2/m

07.CB.05 Dwornikite (Ni,Fe)SO4•(H2O) C 2/c 2/m

07.CB.05 Kieserite MgSO4•(H2O) C 2/c 2/m

07.CB.05 Poitevinite (Cu,Fe,Zn)SO4•(H2O) P1 1

07.CB.05 Szomolnokite FeSO4•(H2O) A2/a 2/m

07.CB.05 Szmikite MnSO4•(H2O) A2/a 2/m

07.CB.05 Cobaltkieserite! CoSO4•H2O C 2/c 2/m

Other Dwornikite Information

References:

NAME( AntBidBlaNic5) 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 - 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
15 - WWW-MINCRYST

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Dwornikite

(Ni,Fe++)SO4•(H2O)
Dana No: 29.06.02.06 Strunz No: 07.CB.05
Locality:

Notes:

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