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:

Hestmandï¿½ 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 Dipyramidal H-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

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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:

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