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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
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

Related to:
  • Spinel Group
    • 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
    FeV
     
    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
    FeAl
     
    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
     
    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
    		[(OH)
     
    16
    		|CO
     
    3
    		] · 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
  • Search for Trevorite in the Natural History Museum (London) online catalogue
  • Trevorite details from Handbook of Mineralogy (PDF)
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    Localities for Trevorite

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    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.
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    (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.
    Israel
     
    • Negev desert
    		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.
    Mineral and/or Locality
    Google
     
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