Trevorite Mineral Data

Trevorite Mineral Data +

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General Trevorite Information

Chemical Formula:

NiFe+++2O4

Composition:

Molecular Weight = 234.38 gm

Iron 47.65 % Fe 68.13 % Fe₂O₃

Nickel 25.04 % Ni 31.87 % NiO

Oxygen 27.30 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NiFe³⁺₂O₄

Environment:

In a small tabular body of nickeliferous serpentinite, probably a contact deposit, along the junction of quartzite and an ultramafic intrusive.

IMA Status:

Valid Species (Pre-IMA) 1921

Locality:

Found three km west of the Scotia talc mine, Bon Accord area, Barberton, Transvaal, South Africa. Link to MinDat.org Location Data.

Name Origin:

Named for Major Tudor Gruffydd Trevor, mining inspector for the Pretoria District, Transvaal, South Africa.

Synonym:

ICSD 67846

PDF 10-325

Trevorite Image

Images:

Trevorite Willemseite

Comments: Small trevorite crystal in massive willemseite.
Location: Bon Accord, Barberton Mountain, Mpumalanga, South Africa. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Trevorite Willemseite

Comments: Waxy translucent green willemseite with black trevorite in schistose rock.
Location: Near Scotia Talc Mine, Barberton Mountain, Transvaal, Mpumalanga, South Africa. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Trevorite Crystallography

Cell Dimensions:

a = 8.41, Z = 8; V = 594.82 Den(Calc)= 5.23

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F d3m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.513(1), 1.476(0.4), 1.605(0.3),

Forms:

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Forms: [ 1 1 1]

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Physical Properties of Trevorite

Cleavage:

None

Color:

Black.

Density:

5.165

Diaphaniety:

Opaque

Fracture:

Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.

Hardness:

5 - Apatite

Luster:

Metallic

Streak:

black

Optical Properties of Trevorite

Optical Data:

NCalc= 2.42 - from Gladstone-Dale relationship (KC = 0.2707) where Ncalc=Dcalc*KC+1
NCalc= 2.4 - from Gladstone-Dale relationship (KC = 0.2707) where Ncalc=Dmeas*KC+1

Calculated Properties of Trevorite

Electron Density:

r_electron=5.00 gm/cc
note: r_Trevorite=5.23 gm/cc.

Fermion Index

Fermion Index = 0.01306
Boson Index = 0.98694

Photoelectric:

PE_Trevorite= 24.67 barns/electron
U=PE_Trevorite x r_electron= 123.29 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Trevorite is Not Radioactive

Trevorite Classification

Dana Class:

7.2.2.5 (7)Multiple Oxides

(7.2)(A+ B++)2 X4 Spinel group

(7.2.2)(Iron subgroup)

7.2.2.1 Magnesioferrite MgFe2O4 F d3m 4/m 3 2/m

7.2.2.2 Jacobsite (Mn,Fe,Mg)(Fe,Mn)2O4 F d3m 4/m 3 2/m

7.2.2.3 Magnetite FeFe2O4 F d3m 4/m 3 2/m

7.2.2.4 Franklinite (Zn,Mn,Fe)(Fe,Mn)2O4 F d3m 4/m 3 2/m

7.2.2.5 Trevorite NiFe2O4 F d3m 4/m 3 2/m

7.2.2.6 Cuprospinel (Cu,Mg)Fe2O4 F d3m 4/m 3 2/m

7.2.2.7 Brunogeierite (Ge,Fe)Fe2O4 F d3m 4/m 3 2/m

Strunz Class:

IV/B.02-40 IV - Oxides

IV/B - Oxides with metal : oxygen = 3:4 (spinel type M3O4 and related), Ferrite-Spinels

IV/B.02 - Spinel group, Magnesioferrite - Franklinite series

IV/B.02-10 Magnesioferrite MgFe2O4 F d3m 4/m 3 2/m

IV/B.02-20 Magnetite FeFe2O4 F d3m 4/m 3 2/m

IV/B.02-30 Jacobsite (Mn,Fe,Mg)(Fe,Mn)2O4 F d3m 4/m 3 2/m

IV/B.02-40 Trevorite NiFe2O4 F d3m 4/m 3 2/m

IV/B.02-50 Cuprospinel (Cu,Mg)Fe2O4 F d3m 4/m 3 2/m

IV/B.02-60 Franklinite (Zn,Mn,Fe)(Fe,Mn)2O4 F d3m 4/m 3 2/m

Other Trevorite Information

References:

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

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

Trevorite

NiFe+++2O4
Dana No: 7.2.2.5 Strunz No: IV/B.02-40
Locality:

Notes: