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 % H2 O
Sulfur 18.64 % S 46.53 % SO3
Oxygen 46.49 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Ni0.75 Fe2+ 0.25 (SO4 )•(H2 O)
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
X Ray Diffraction:
By Intensity(I/Io ): 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:
PEDwornikite = 13.53 barns/electronU=PEDwornikite x r Electron 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 � 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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