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Trevorite

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Scotia Talc mine, Bon Accord, Barberton District, Mpumalanga Province, South Africa
© Knut Eldjarn

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Formula:
Ni
2+
 
Fe
3+
2
O
 
4
System:IsometricColour:Black with green or ...
Hardness:5
Member of:Spinel Group
Name:Named after Major Tudor Gruffydd Trevor, mining inspector for the Pretoria District, Transvaal, South Africa, where the species was first found.


Spinel Group, Fe series.

Classification of Trevorite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:4/B.02-40
Nickel-Strunz 10th (pending) edition ID:4.BB.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
B : Metal: Oxygen = 3:4 and similar
B : With only medium-sized cations
Dana 8th edition ID:7.2.2.5

7 : MULTIPLE OXIDES
2 : AB2X4
Hey's CIM Ref.:7.22.6

7 : Oxides and Hydroxides
22 : Oxides of Ni
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Type Occurrence of Trevorite

Type Locality:Bon Accord Ni Deposit, Bon Accord, Barberton District, Mpumalanga Province, South Africa
Year of Discovery:1921

Physical Properties of Trevorite

Lustre:Sub-Metallic
Diaphaneity (Transparency):Opaque
Colour:Black with green or brown tint
Streak:Light brown
Hardness (Mohs):5
Tenacity:Brittle
Density (measured):5.164 g/cm3
Density (calculated):5.2 g/cm3

Crystallography of Trevorite

Crystal System:Isometric
Class (H-M):m3m (4/m 3 2/m) - Hexoctahedral
Space Group:Fd3m {F41/d 3 2/m}
Cell Parameters:a = 8.41Å
Unit Cell Volume:V 594.82 ų (Calculated from Unit Cell)
Morphology:Massive. Rarely found as crystals.
Twinning:On {111}.

Chemical Properties of Trevorite

Formula:
Ni
2+
 
Fe
3+
2
O
 
4
Essential elements:Fe, Ni, O
All elements listed in formula:Fe, Ni, O

Relationship of Trevorite to other Species

Member of:Spinel Group
Other Members of Group:

- +
Chromite
FeCr
 
2
O
 
4
Franklinite
Zn
2+
 
Fe
3+
2
O
 
4
Gahnite
ZnAl
 
2
O
 
4
Galaxite
(Mn,Fe,Mg)(Al,Fe)
 
2
O
 
4
Hercynite
Fe
2+
 
Al
 
2
O
 
4
Jacobsite
Mn
2+
 
Fe
3+
2
O
 
4
Magnesiochromite
MgCr
 
2
O
 
4
Magnesioferrite
MgFe
3+
2
O
 
4
Magnetite
Fe
2+
 
Fe
3+
2
O
 
4
Qandilite
(Mg,Fe)
 
2
(Ti,Fe,Al)O
 
4
Spinel
MgAl
 
2
O
 
4
Related Minerals - Nickel-Strunz Grouping):

- +
4.BB.05Brunogeierite
(Ge,Fe)Fe
 
2
O
 
4
4.BB.05Chromite
FeCr
 
2
O
 
4
4.BB.05Cochromite
(Co,Ni,Fe)(Cr,Al)
 
2
O
 
4
4.BB.05Coulsonite
Fe
2+
 
V
3+
2
O
 
4
4.BB.05Cuprospinel
Cu
2+
 
Fe
3+
2
O
 
4
4.BB.05Filipstadite
(Mn,Mg)
 
2
(Sb
 
.5
Fe
 
.5
)O
 
4
4.BB.05Franklinite
Zn
2+
 
Fe
3+
2
O
 
4
4.BB.05Gahnite
ZnAl
 
2
O
 
4
4.BB.05Galaxite
(Mn,Fe,Mg)(Al,Fe)
 
2
O
 
4
4.BB.05Hercynite
Fe
2+
 
Al
 
2
O
 
4
4.BB.05Jacobsite
Mn
2+
 
Fe
3+
2
O
 
4
4.BB.05Manganochromite
(Mn,Fe)(Cr,V)
 
2
O
 
4
4.BB.05Magnesiocoulsonite
MgV
 
2
O
 
4
4.BB.05Magnesiochromite
MgCr
 
2
O
 
4
4.BB.05Magnesioferrite
MgFe
3+
2
O
 
4
4.BB.05Magnetite
Fe
2+
 
Fe
3+
2
O
 
4
4.BB.05Nichromite
(Ni,Co,Fe)(Cr,Fe,Al)
 
2
O
 
4
4.BB.05Qandilite
(Mg,Fe)
 
2
(Ti,Fe,Al)O
 
4
4.BB.05Spinel
MgAl
 
2
O
 
4
4.BB.05Ulvöspinel
Fe
 
2
TiO
 
4
4.BB.05Vuorelainenite
(Mn,Fe)(V,Cr)
 
2
O
 
4
4.BB.05Zincochromite
ZnCr
 
2
O
 
4
4.BB.10Hausmannite
MnMn
 
2
O
 
4
4.BB.10Hetaerolite
ZnMn
 
2
O
 
4
4.BB.10Hydrohetaerolite
ZnMn
 
2
O
 
4
 · H
 
2
O
4.BB.10Iwakiite
Mn(Fe,Mn)
 
2
O
 
4
4.BB.15Maghemite
Fe
3+
2
O
 
3
4.BB.15Titanomaghemite
Fe
3+
 
(Fe
3+
 
,Ti
4+
 
,Fe
2+
 
,◻)
 
2
O
 
4
4.BB.20Tegengrenite
(Mg,Mn
2+
 
)
 
2
Sb
5+
0.5
(Mn
3+
 
,Si,Ti)
 
0.5
O
 
4
4.BB.25Xieite
Fe
2+
 
Cr
 
2
O
 
4
Related Minerals - Hey's Index Grouping:

- +
7.22.1Bunsenite
NiO
7.22.3Theophrastite
Ni(OH)
 
2
7.22.4Jamborite
(Ni
2+
 
,Ni
3+
 
,Co,Fe)(OH)
 
2
(OH,S,H
 
2
O)
7.22.5Takovite
Ni
 
6
Al
 
2
(CO
 
3
)(OH)
 
16
 · 4H
 
2
O
7.22.7Nichromite
(Ni,Co,Fe)(Cr,Fe,Al)
 
2
O
 
4

Other Names for Trevorite

Other Languages:
German:Trevorit
Russian:Треворит
Spanish:Trevorita

Other Information

Fluorescence in UV light:None
Magnetism:Diamagnetic
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Trevorite

Reference List:

- +
Crosse (1921), Journal of the Chemical, Metallurgical and Mineralogical Society of South Africa: 21: 126.

Crosse (1923), American Mineralogist: 8: 37.

Walker (1923), University of Toronto Studies, Geology series: 16: 53.

Doelter (1926): 3(2): 666 (as nickelmagnetite).

Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Seventh edition, Volume I: 698-707.

American Mineralogist (1969): 54: `1204-1208.

American Mineralogist (1972): 57: 1524-1527.

Internet Links for Trevorite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Trevorite details from Handbook of Mineralogy (PDF)
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    • Localities for Trevorite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Atlantic Ocean
     
    • Mid-Atlantic Ridge complex
    		Gablina, I.F., Semkova, T.A., Stepanova, T.V., and Gor'kova, N.V. (2006): Lithology and Mineral Resources 41(1), 27-44.
    Australia
     
    • Western Australia
      • Goldfields-Esperance region
        • Leonora Shire
          • Leonora
    		Economic Geology; October 1981; v. 76; no. 6; p. 1686-1697
    Burundi
     
    Frank K. Mazdab collection (will verify with EPMA)
    Israel
     
    • Negev
    		Vapnik, Y., Sokol, E., Murashko M., Sharygin V. (2006): The enigma of Hatrurim. Mineralogical Almanac, 10, 69-77.
    Italy
     
    • Sardinia
      • Nuoro Province
        • Gadoni
    		Stara, P., Rizzo, R., Sabelli, C., Ibba, A. (1999): I minerali di Funtana Raminosa. Rivista Mineralogica Italiana, 1/1999, 10-27.
    South Africa
     
    • Mpumalanga Province
      • Barberton District
        • Bon Accord
    		Am Min 57 (1972), 1524
    Am. Min. 61, 502 (1976); Am Min 54 (1969), 1204-1208
    • Northwest Province
    		www.lpi.usra.edu/meetings/impacts97/pdf/6055.pdf.
    USA
     
    • Nevada
      • Nye Co.
        • Gabbs District
          • Gabbs
    		NBMG Spec Pub 31 Minerals of Nevada
    • Oregon
      • Josephine Co.
        • Josephine Creek District
    		www.geo.cornell.edu/geology/faculty/Bird.html.
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    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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