Donathite Mineral Data

General Donathite Information

Chemical Formula:

(Fe++,Mg)(Cr,Fe+++)2O4

Composition:

Molecular Weight = 222.61 gm

Magnesium 1.09 % Mg 1.81 % MgO

Chromium 35.04 % Cr 51.21 % Cr₂O₃

Iron 35.12 % Fe 29.05 % FeO / 17.93 % Fe₂O₃

Oxygen 28.75 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺_0.9Mg_0.1Cr_1.5Fe³⁺_0.5O₄

Environment:

Discredited as a mixture of two spinels, one cubic and one tetragonal.

IMA Status:

Discredited IMA 1998 - Published 1969

Locality:

Hestmandö Island, Norway. Link to MinDat.org Location Data.

Name Origin:

Named for M. Donath, who described the material in I930.

Synonym:

Discredited

Donathite Image

Images:

Donathite

Comments: Black granular donathite on iron.
Location: Hestmondo Island, Nordland, Norway. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Donathite Crystallography

Axial Ratios:

a:c = 1:0.99556

Cell Dimensions:

a = 8.342, c = 8.305, Z = 10; V = 577.94 Den(Calc)= 6.40

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: P 4/nnm

Physical Properties of Donathite

Cleavage:

None

Color:

Black.

Density:

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Hardness:

6.5-7 - Pyrite-Quartz

Luster:

Metallic

Streak:

black brown

Optical Properties of Donathite

Optical Data:

NCalc= 2.68 - from Gladstone-Dale relationship (KC = 0.2632) where Ncalc=Dcalc*KC+1
NCalc= 2.32 - from Gladstone-Dale relationship (KC = 0.2632) where Ncalc=Dmeas*KC+1

Calculated Properties of Donathite

Electron Density:

Bulk Density (Electron Density)=6.07 gm/cc
note: Specific Gravity of Donathite =6.40 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_Donathite= 18.79 barns/electron
U=PE_Donathite x rElectron Density= 114.07 barns/cc.

Radioactivity:

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

Donathite Classification

Dana Class:

04.00.00.00 (04)Oxide Minerals

(04.00)Without Dana Classification Numbers

(04.00.00)Oxide

04.00.00.00 Ashanite? (Nb,Ta,U,Fe,Mn)4O8 Pcan 2/m 2/m 2/m

04.00.00.00 Chubutite* Pb7O6Cl2 Unk Ortho

04.00.00.00 Clinobirnessite* Na4Mn14O27•9(H2O) Mono

04.00.00.00 Donathite? (Fe,Mg)(Cr,Fe)2O4 P 4/nnm 4/m 2/m 2/m

04.00.00.00 IMA2008-022 UO2(OH)2 pseudo-orthorhombic Mono

04.00.00.00 Krasnogorite* WO3 Pmnb 2/m 2/m 2/m

04.00.00.00 Mengxianminite* (Ca,Na)3(Fe,Mn)2Mg2(Sn,Zn)5Al8O29 Unk Ortho

04.00.00.00 Romanite* (Fe,U,Pb)2(Ti,Fe)O4 Trig ? Trig

04.00.00.00 Tantalowodginite* (Mn2,[])4Ta4Ta8O32 C 2/c 2/m

04.00.00.00 Ungursaite* NaCa5(Ta,Nb)24O65(OH) P 6₃/m,P 6₃ Hex

04.00.00.00 Wolframoixiolite* (Fe,Mn,Nb)(Nb,W,Ta)O4 Pc m

Strunz Class:

04.BB.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.B - Metal:Oxygen = 3:4 and similar

04.BB -With only medium-sized cations

04.BB.05 Cochromite (Co,Ni,Fe)(Cr,Al)2O4 F d3m 4/m 3 2/m

04.BB.05 Filipstadite (Mn,Mg)4SbFeO8 pseudo ISO 2/m 2/m 2/m

04.BB.05 Magnetite FeFe2O4 F d3m 4/m 3 2/m

04.BB.05 Gahnite ZnAl2O4 F d3m 4/m 3 2/m

04.BB.05 Chromite FeCr2O4 F d3m 4/m 3 2/m

04.BB.05 Galaxite (Mn,Mg)(Al,Fe)2O4 F d3m 4/m 3 2/m

04.BB.05 Cuprospinel (Cu,Mg)Fe2O4 F d3m 4/m 3 2/m

04.BB.05 Donathite? (Fe,Mg)(Cr,Fe)2O4 P 4/nnm 4/m 2/m 2/m

04.BB.05 Brunogeierite (Ge,Fe)Fe2O4 F d3m 4/m 3 2/m

04.BB.05 Coulsonite FeV2O4 F d3m 4/m 3 2/m

04.BB.05 Hercynite FeAl2O4 F d3m 4/m 3 2/m

04.BB.05 Franklinite (Zn,Mn,Fe)(Fe,Mn)2O4 F d3m 4/m 3 2/m

04.BB.05 Jacobsite (Mn,Fe,Mg)(Fe,Mn)2O4 F d3m 4/m 3 2/m

04.BB.05 Magnesiochromite MgCr2O4 F d3m 4/m 3 2/m

04.BB.05 Magnesioferrite MgFe2O4 F d3m 4/m 3 2/m

04.BB.05 Magnesiocoulsonite MgV2O4 F d3m 4/m 3 2/m

04.BB.05 Manganochromite (Mn,Fe)(Cr,V)2O4 F d3m 4/m 3 2/m

04.BB.05 Qandilite (Mg,Fe)2(Ti,Fe,Al)O4 F d3m 4/m 3 2/m

04.BB.05 Nichromite (Ni,Co,Fe)(Cr,Fe,Al)2O4 F d3m 4/m 3 2/m

04.BB.05 Spinel MgAl2O4 F d3m 4/m 3 2/m

04.BB.05 Ulvospinel TiFe2O4 F d3m 4/m 3 2/m

04.BB.05 Zincochromite ZnCr2O4 F d3m 4/m 3 2/m

04.BB.05 Trevorite NiFe2O4 F d3m 4/m 3 2/m

04.BB.05 Vuorelainenite (Mn,Fe)(V,Cr)2O4 F d3m 4/m 3 2/m

Other Donathite Information

References:

NAME( AmMin, V83, p189) PHYS. PROP.(AmMin, V83, p189)

See Also:

Links to other databases for Donathite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

Search for Donathite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Donathite :

A Bijoux Google Search for Donathite
Adam's Minerals Google Search for Donathite
Cape Minerals Google Search for Donathite
Dakota Matrix Minerals Google Search for Donathite
Excalibur Mineral Corp. Google Search for Donathite
Exceptional Minerals Google Search for Donathite
John Betts Fine Minerals Search for Donathite
McDougall Minerals Google Search for Donathite
Mineral News Website Link
Rock and Mineral Shows Google Search for Donathite
Weinrich Minerals, Inc. Google Search for Donathite

Ask about Donathite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Donathite

(Fe++,Mg)(Cr,Fe+++)2O4
Dana No: 04.00.00.00 Strunz No: 04.BB.05
Locality:

Notes: