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Major Trevor
Black with green or brown tint
Specific Gravity:
Crystal System:
Member of:
Named after Major Tudor Gruffydd Trevor (1865 – 1958), mining inspector for the Pretoria District, Transvaal, South Africa, where the species was first found.
Spinel Group, Fe series.

Hide all sections | Show all sections

Classification of TrevoriteHide

Approved, 'Grandfathered' (first described prior to 1959)

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

2 : AB2X4

7 : Oxides and Hydroxides
22 : Oxides of Ni

Physical Properties of TrevoriteHide

Black with green or brown tint
Light brown
5.164 g/cm3 (Measured)    5.2 g/cm3 (Calculated)

Chemical Properties of TrevoriteHide

IMA Formula:

Crystallography of TrevoriteHide

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

Type Occurrence of TrevoriteHide

Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA, 132464, 132465.

Other Language Names for TrevoriteHide

Simplified Chinese:镍磁铁矿

Varieties of TrevoriteHide

Ferroan TrevoriteAn Fe-bearing variety associated with heazlewoodite, nickel, and 'UM1981-20-S:NiSbSnTe'.

Relationship of Trevorite to other SpeciesHide

Member of:
Other Members of this group:
ChromiteFe2+Cr3+2O4Iso. m3m (4/m 3 2/m) : Fd3m
FrankliniteZn2+Fe3+2O4Iso. m3m (4/m 3 2/m) : Fd3m
GahniteZnAl2O4Iso. m3m (4/m 3 2/m) : Fd3m
GalaxiteMn2+Al2O4Iso. m3m (4/m 3 2/m) : Fd3m
HercyniteFe2+Al2O4Iso. m3m (4/m 3 2/m) : Fd3m
JacobsiteMn2+Fe3+2O4Iso. m3m (4/m 3 2/m) : Fd3m
MagnesiochromiteMgCr2O4Iso. m3m (4/m 3 2/m) : Fd3m
MagnesioferriteMgFe3+2O4Iso. m3m (4/m 3 2/m) : Fd3m
MagnetiteFe2+Fe3+2O4Iso. m3m (4/m 3 2/m) : Fd3m
Nichromite(Ni,Co,Fe)(Cr,Fe,Al)2O4Iso. m3m (4/m 3 2/m) : Fd3m
SpinelMgAl2O4Iso. m3m (4/m 3 2/m) : Fd3m
XieiteFe2+Cr2O4Orth. mmm (2/m 2/m 2/m)

Common AssociatesHide

Associated Minerals Based on Photo Data:
Népouite5 photos of Trevorite associated with Népouite on
Willemseite2 photos of Trevorite associated with Willemseite on
Talc1 photo of Trevorite associated with Talc on
Whitlockite Group1 photo of Trevorite associated with Whitlockite Group on

Related Minerals - Nickel-Strunz GroupingHide

4.BB.ChenmingiteFeCr2O4Orth. mmm (2/m 2/m 2/m) : Pnma
4.BB.05ChromiteFe2+Cr3+2O4Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.05FrankliniteZn2+Fe3+2O4Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.05GahniteZnAl2O4Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.05GalaxiteMn2+Al2O4Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.05HercyniteFe2+Al2O4Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.05JacobsiteMn2+Fe3+2O4Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.05MagnesiochromiteMgCr2O4Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.05MagnesioferriteMgFe3+2O4Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.05MagnetiteFe2+Fe3+2O4Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.05Nichromite(Ni,Co,Fe)(Cr,Fe,Al)2O4Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.05SpinelMgAl2O4Iso. m3m (4/m 3 2/m) : Fd3m
4.BB.10HausmanniteMn2+Mn3+2O4Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
4.BB.10HetaeroliteZnMn2O4Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
4.BB.10HydrohetaeroliteZnMn2O4 · H2OTet. 4/mmm (4/m 2/m 2/m) : I41/amd
4.BB.10IwakiiteMn2+Fe3+2O4Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
4.BB.15MaghemiteFe3+2O3Iso. 4 3 2 : P41 3 2
4.BB.15TitanomaghemiteFe3+(Fe3+,Ti4+,Fe2+,◻)2O4Iso. 4 3 2 : P43 3 2
4.BB.25XieiteFe2+Cr2O4Orth. mmm (2/m 2/m 2/m)

Related Minerals - Dana Grouping (8th Ed.)Hide m3m (4/m 3 2/m) : Fd3m m3m (4/m 3 2/m) : Fd3m m3m (4/m 3 2/m) : Fd3m m3m (4/m 3 2/m) : Fd3m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

7.22.1BunseniteNiOIso. m3m (4/m 3 2/m) : Fm3m
7.22.3TheophrastiteNi(OH)2Trig. 3m (3 2/m) : P3m1
7.22.4JamboriteNi2+1-xCo3+x(OH)2-x(SO4)x · nH2OTrig. 3m (3 2/m) : R3m
7.22.5TakoviteNi6Al2(OH)16[CO3] · 4H2OTrig.
7.22.7Nichromite(Ni,Co,Fe)(Cr,Fe,Al)2O4Iso. m3m (4/m 3 2/m) : Fd3m

Fluorescence of TrevoriteHide

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for TrevoriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Crosse, A.F. (1921) A rich nickel ore. Journal of the Chemical, Metallurgical and Minining Society of South Africa: 21: 126-127.
Wherry, E.T. (1923) New minerals: Doubtful species. American Mineralogist: 8: 37.
Walker, T.L. (1923) Trevorite, a distinct mineral species. Contributions to Canadian Mineralogy, University of Toronto Studies, Geology Series: 16: 53-54.
Wherry, E.T. (1924) Redefinition of species. American Mineralogist: 9: 97-98.
Doelter, C. (1926) Mineralchemie: 3(2): 666. (as nickelmagnetite)
Palache, C., Berman, H., Frondel, C. (1944) The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Seventh edition, Volume I: 698-707.
de Waal, S.A. (1969) Nickel minerals from Barberton, South Africa: I. ferroan trevorite. American Mineralogist: 54: 1204-1208.
de Waal, S.A. (1972) Mineralogical notes: nickel minerals from Barberton, South Africa: V. trevorite, redescribed. American Mineralogist: 57: 1524-1527.
Blesa, M.C., Amador, U., Morán, E., Menéndez, N., Tornero, J.D., Rodríguez-Carvajal, J. (1993) Synthesis and characterization of nickel and magnesium ferrites obtained from α-NaFeO2. Solid State Ionics: 63: 429-436.
O'Driscoll, B., Clay, P.L., Cawthorn, P.L., Lenaz, D., Adetunji, J., Kronz, A. (2014) Trevorite: Ni-rich spinel formed by metasomatism and desulfurization processes at Bon Accord, South Africa? Mineralogical Magazine: 78: 145-163.
Tredoux, M., Zaccarini, F., Garuti, G., Miller, D.E. (2016) Phases in the Ni-Sb-As system which occur in the Bon Accord oxide body, Barberton greenstone belt, South Africa. Mineralogical Magazine: 80: 187-198.

Internet Links for TrevoriteHide

Localities for TrevoriteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Atlantic Ocean
  • Mid-Atlantic Ridge complex
Schmidt, R. A., & Keil, K. (1966). Electron microprobe study of spherules from Atlantic Ocean sediments. Geochimica et Cosmochimica Acta, 30(5), 471-478.
Gablina, I.F., Semkova, T.A., Stepanova, T.V., and Gor'kova, N.V. (2006): Lithology and Mineral Resources 41(1), 27-44.
  • Western Australia
    • Leonora Shire
      • Ten Mile Outcamp
Thebaud, N., Barnes, S., Fiorentini, M., Komatiites of the Wildara Leonora Belt Yilgarn Craton Western Australia- the missing link in the Kalgoorlie Terrane, Centre for Exploration Targeting (U.W.A), CSIRO, (date?)
Economic Geology; October 1981; v. 76; no. 6; p. 1686-1697; O'Driscoll, B., Clay, P. L., Cawthorn, R. G., Lenaz, D., Adetunji, J., & Kronz, A. (2014). Trevorite: Ni-rich spinel formed by metasomatism and desulfurization processes at Bon Accord, South Africa?. Mineralogical Magazine, 78(1), 145-163.
  • Rutana Province
Frank K. Mazdab collection (will verify with EPMA); The Royal Museum for Central Africa (RMCA), sample # 13203;
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium)
      • Lavrion District slag localities
        • Agios Konstantinos [St Constantine] (Kamariza)
Kolitsch, U., Rieck, B., Brandstätter, F., Schreiber, F., Fabritz, K. H., Blaß, G. & Gröbner, J. (2014): Neufunde aus dem altem Bergbau und den Schlacken von Lavrion (II). Mineralien-Welt 25 (2), 82-95 (in German).; Koshlyakova, N.N., Zubkova, N.V., Pekov, I.V., Giester, G., Pushcharovsky, D.Yu., Chukanov, N.V., Voudouris, P., Magganas, A., Katerinopoulos, A. (2016): Crystal chemistry of a Ni-Mg-analogue of lyonsite from slags of Lavrion, Greece. Neues Jahrbuch für Mineralogie - Abhandlungen: Journal of Mineralogy and Geochemistry 193, 113-120.
  • Nagaland
    • Tuensang District
Vaish, A. K., Singh, S. D., Minj, R. K., & Gupta, R. C. (2013). Exploration and Exploitation of Multi-Metallic Magnetite Ore of Nagaland for Value Added Product. Transactions of the Indian Institute of Metals, 66(5-6), 491-499.
  • Negev
Vapnik, Y., Sokol, E., Murashko M., Sharygin V. (2006): The enigma of Hatrurim. Mineralogical Almanac, 10, 69-77.
  • 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.
Pavel M. Kartashov analytical data of 2017
  • Lower Silesia (Dolnośląskie)
    • Ząbkowice Slaskie District
      • Ząbkowice (Frankenstein)
Sachanbiński et al. 2000: Heavy minerals in the serpentinite weathering cover of the Szklary massif. Geologia Sudetica, vol. 33, pp. 131-141.
  • Far-Eastern Region
    • Koriak Autonomous Okrug
      • Koryak Upland (Koriak; Koriakskhiye)
        • Iomrautvaam Massif
          • Chetkinvaiam tectonic melange
            • Khatyrka river
              • Listvenitovyi stream
Bindi, L. et al. (2015): Natural quasicrystal with decagonal symmetry. Scientific Reports 5, Article number: 9111 [doi:10.1038/srep09111].; Bindi, L., Yao, N., Lin, C., Hollister, L. S., Andronicos, C. L., Distler, V. V., ... & Steinhardt, W. M. (2015). Decagonite, Al71Ni24Fe5, a quasicrystal with decagonal symmetry from the Khatyrka CV3 carbonaceous chondrite. American Mineralogist, 100(10), 2340-2343.
South Africa (TL)
  • Mpumalanga Province
    • Ehlanzeni District
      • Barberton
        • Bon Accord
Am Min 57 (1972), 1524; O'Driscoll, B., Clay, P. L., Cawthorn, R. G., Lenaz, D., Adetunji, J., & Kronz, A. (2014). Trevorite: Ni-rich spinel formed by metasomatism and desulfurization processes at Bon Accord, South Africa?. Mineralogical Magazine, 78(1), 145-163.; Zaccarini, F., Tredoux, M., Miller, D. E., Garuti, G., Aiglsperger, T., & Proenza, J. A. (2014). The occurrence of platinum-group element and gold minerals in the Bon Accord Ni-oxide body, South Africa. American Mineralogist, 99(8-9), 1774-1782.; Cairncross, B. and Dixon, R., (1995) Minerals of South Africa. The Geological Society of South Africa: 20; Am. Min. 61, 502 (1976); Am Min 54 (1969), 1204-1208
  • North West Province
    • Bojanala Platinum District
      • Western Bushveld Complex
        • Rustenburg (Rustenburg District)
Kottke-Levin, J., Gauert, C., Merkle, R., & Sommer, H. (2008, December). Pilot study of melt inclusions in chromites of the Merensky Reef reflecting melt compositions at Karee Mine, western Bushveld Complex, South Africa. In AGU Fall Meeting Abstracts (Vol. 1, p. 2085).
    • Dr Ruth Segomotsi Mompati District
      • Vryburg
  • Arizona
    • Coconino Co.
      • Winslow
        • Meteor Crater area
Hofmann, B. A. (1992). Uranium accumulation during weathering of Canon Diablo meteoritic iron. Meteoritics, 27(1), 101-103.
  • Nevada
    • Nye Co.
      • Gabbs District
        • Gabbs
NBMG Spec Pub 31 Minerals of Nevada
  • Oregon
    • Josephine Co.
      • Josephine Creek District
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