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Tomichite

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About TomichiteHide

Formula:
(V,Fe)4Ti3AsO13(OH)
Colour:
Black
Lustre:
Metallic
Hardness:
6
Specific Gravity:
4.16
Crystal System:
Monoclinic
Name:
Named in honor of Stephan A. Tomich (b. 1914), consulting geologist of Perth, Western Australia, who provided the first specimen for study.
This page provides mineralogical data about Tomichite.


Classification of TomichiteHide

Approved
Approval Year:
1978
First Published:
1979
4.JB.55

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
B : Arsenites, antimonites, bismuthites; with additional anions, without H2O
46.2.3.1

46 : ANTIMONITES AND ARSENITES CONTAINING HYDROXYL OR HALOGEN
2 : Miscellaneous
23.22

23 : Arsenites

Physical Properties of TomichiteHide

Metallic
Transparency:
Opaque
Colour:
Black
Streak:
Black
Hardness:
Hardness:
VHN50=800(127) kg/mm2 - Vickers
Cleavage:
None Observed
Density:
4.16 g/cm3 (Measured)    4.42 g/cm3 (Calculated)

Optical Data of TomichiteHide

Type:
Anisotropic
Anisotropism:
Moderate
Reflectivity:
470nmR=15.9%
546nmR=16.3%
589nmR=16.6%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 16.6%.
Colour in reflected light:
Gray
Internal Reflections:
None
Pleochroism:
Not Visible

Chemical Properties of TomichiteHide

Formula:
(V,Fe)4Ti3AsO13(OH)
IMA Formula:
V3+4Ti4+3As3+O13(OH)

Crystallography of TomichiteHide

Crystal System:
Monoclinic
Cell Parameters:
a = 7.1 Å, b = 14.19 Å, c = 4.99 Å
β = 105.05°
Ratio:
a:b:c = 0.5 : 1 : 0.352
Unit Cell V:
485.49 ų (Calculated from Unit Cell)

Type Occurrence of TomichiteHide

General Appearance of Type Material:
Tiny euhedral crystals in quartz
Place of Conservation of Type Material:
Western Australian Museum, Perth, Australia, M.67.1991, MDC6417.
The Natural History Museum, London, England, 1979,532.
National Museum of Natural History (Smithsonian), Washington, D.C., USA, 146187.
Reference:
Nickel, E.H., Grey, I.E. (1979) Tomichite, a new oxide mineral from Western Australia. Mineralogical Magazine: 43: 469-471.

Synonyms of TomichiteHide

Other Language Names for TomichiteHide

German:Tomichit
Simplified Chinese:砷钛钒石
Spanish:Tomichita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Pyrite1 photo of Tomichite associated with Pyrite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

4.JB.05Fetiasite(Fe3+,Fe2+,Ti)3(As2O5)O2Mon.
4.JB.10ManganarsiteMn3(As2O4)(OH)4
4.JB.15MagnussoniteMn10As6O18(OH,Cl)2Iso. m3m (4/m 3 2/m) : Ia3d
4.JB.15UM1984-09-AsO:ClHMnMn10As6O18(OH)ClTet. 4/mmm (4/m 2/m 2/m) : I41/acd
4.JB.20ArmangiteMn2+26(AsO3)14(HAsO3)4(CO3)Trig. 3 : P3
4.JB.25NanlingiteNa(Ca5Li)Mg12(AsO3)2[Fe(AsO3)6]F14Trig.
4.JB.30AsbecasiteCa3(Ti,Sn4+)Be2(AsO3)6(SiO4)2Trig. 3m : P3c1
4.JB.35StenhuggariteCaFeSb(AsO3)2OTet.
4.JB.40TrigonitePb3Mn2+(AsO3)2(HAsO3)Mon. m
4.JB.45FinnemanitePb5(AsO3)3ClHex. 6/m : P63/m
4.JB.50GebharditePb8(As2O5)2OCl6Mon.
4.JB.55DerbyliteFe3+4Ti3Sb3+O13(OH)Mon. 2/m : P21/m
4.JB.55Graeserite(Fe3+ ,Ti)4Ti3AsO13(OH)Mon.
4.JB.60Hemloite(Ti,V3+,Fe3+,Al)12(As3+,Sb3+)2O23(OH)Tric. 1 : P1
4.JB.65FreediteCu+Pb8(AsO3)2O3Cl5Mon. 2/m : B2/m
4.JB.70GeorgiadèsitePb4(AsO3)Cl4(OH)Mon.
4.JB.75Ekatite(Fe3+,Fe2+,Zn)12(AsO3)6(AsO3,HSiO4)2(OH)6Hex.

Related Minerals - Dana Grouping (8th Ed.)Hide

46.2.3.2DerbyliteFe3+4Ti3Sb3+O13(OH)Mon. 2/m : P21/m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

23.2NanlingiteNa(Ca5Li)Mg12(AsO3)2[Fe(AsO3)6]F14Trig.
23.3LeiteiteZn(As2O4)Mon. 2/m : P21/b
23.5Kuznetsovite(Hg+2)Hg2+(AsO4)ClIso. 2 3 : P21 3
23.6PaulmooreitePb2[As2O5]Mon. 2/m : P21/b
23.7EcdemitePb6Cl4(As2O7)Tet.
23.8HeliophyllitePb6Cl4(As2O7)Orth.
23.9FinnemanitePb5(AsO3)3ClHex. 6/m : P63/m
23.10GebharditePb8(As2O5)2OCl6Mon.
23.11Zimbabweite(Na,K)2PbAs4(Ta,Nb,Ti)4O18Orth.
23.13RouseitePb2Mn2+[AsO3]2 · 2H2OTric.
23.14FreediteCu+Pb8(AsO3)2O3Cl5Mon. 2/m : B2/m
23.15ManganarsiteMn3(As2O4)(OH)4
23.17ArmangiteMn2+26(AsO3)14(HAsO3)4(CO3)Trig. 3 : P3
23.18KaribibiteFe3+3(As3+O2)4(As3+2O5)(OH)Orth. mmm (2/m 2/m 2/m) : Pnma
23.19SchneiderhöhniteFe2+Fe3+3As3+5O13Tric. 1 : P1
23.20Lazarenkoite(Ca,Fe2+)Fe3+As3+3O7 · 3H2OOrth.
23.21StenhuggariteCaFeSb(AsO3)2OTet.

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 TomichiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Nickel, E.H., Grey, I.E. (1979) Tomichite, a new oxide mineral from Western Australia. Mineralogical Magazine: 43: 469-471.
Fleischer, M., Cabri, L.J., Chao, G.Y., Pabst, A. (1980) New mineral names. American Mineralogist: 65: 808-814.
Grey, I.E., Madsen, I.C., Harris, D.C. (1987) Barian tomichite, Ba0.5(As2)0.5Ti2(V,Fe)5O13(OH), its crystal structure and relationship to derbylite and tomichite. American Mineralogist: 72: 201-208.

Internet Links for TomichiteHide

Localities for TomichiteHide

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.
Australia
 
  • Western Australia
    • Kalgoorlie-Boulder Shire
      • Kalgoorlie-Boulder
        • Golden Mile Mines
Grey, I., Nickel, E.(1981): Tivanite a Oxhydroxide Mineral from Western Australia and its Structural Relationship to Rutile and Diaspore, American Mineralogist (1981):66: 866-871
MM 1980, 469
Canada
 
  • Ontario
    • Thunder Bay District
      • Bomby Township
Mineralogical Magazine 1988 52 : 691-697
Mineral and/or Locality  
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