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Tomichite

A valid IMA mineral species
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04131420017271927118092.jpg
Tomichite

Hemlo gold deposit, Bomby Township, Thunder Bay District, Ontario, Canada
04131420017271927118092.jpg
Tomichite

Hemlo gold deposit, Bomby Township, Thunder Bay District, Ontario, Canada
04131420017271927118092.jpg
Tomichite

Hemlo gold deposit, Bomby Township, Thunder Bay District, Ontario, Canada
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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, d. 2007), consulting geologist of Perth, Western Australia, who provided the first specimen for study.
V analogue of graeserite. VAs analogue of derbylite.

Note: space groups of the 3 species may differ.


Unique IdentifiersHide

Mindat ID:
3993
Long-form identifier:
mindat:1:1:3993:8

Similar NamesHide

TumchaiteA valid IMA mineral speciesNa2Zr(Si4O11) · 2H2O

IMA Classification of TomichiteHide

Classification of TomichiteHide

Strunz-mindat (2026):
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
Dana 8th ed.:
46.2.3.1

46 : ANTIMONITES AND ARSENITES CONTAINING HYDROXYL OR HALOGEN
2 : Miscellaneous
Hey's CIM Ref.:
23.22

23 : Arsenites

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference for Standard
TomIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of TomichiteHide

Lustre:
Metallic
Transparency:
Opaque
Colour:
Black
Streak:
Black
Hardness:
6 on Mohs scale
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

Anisotropism:
Moderate
Reflectivity:
WavelengthR1 (%)
470nm15.9%
546nm16.3%
589nm16.6%


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

Chemistry of TomichiteHide

Mindat Formula:
(V,Fe)4Ti3AsO13(OH)
Element Weights:
Element% weight
O34.605 %
V31.480 %
Ti22.185 %
As11.575 %
H0.156 %

Calculated from ideal end-member formula.
Elements listed:
As, Fe, H, O, Ti, V - search for minerals with similar chemistry

Crystallography of TomichiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Setting:
P21/m
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)

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0001067TomichiteGrey I E, Madsen I C, Harris D C (1987) Barian tomichite, Ba.5(As2).5Ti2(V,Fe)5O13(OH), its crystal structure and relationship to derbylite and tomichite American Mineralogist 72 201-20819870293
0001066TomichiteGrey I E, Madsen I C, Harris D C (1987) Barian tomichite, Ba.5(As2).5Ti2(V,Fe)5O13(OH), its crystal structure and relationship to derbylite and tomichite American Mineralogist 72 201-20819870293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.663 Å(100)
2.836 Å(90)
1.572 Å(50)
3.092 Å(40)
2.023 Å(30)
1.712 Å(30)
4.994 Å(20)
Comments:
Kalgoorlie, Western Australia. Data from the type description.

Geological EnvironmentHide

Type Occurrence of TomichiteHide

Type Locality:
ⓘ Perseverance Gold Mine (Boulder Perseverance Mine), Kalgoorlie Consolidated Gold Mines, Kalgoorlie-Boulder, Kalgoorlie-Boulder Shire, Western Australia, Australia
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 (328) 469-471 doi:10.1180/minmag.1979.043.328.04

Synonyms of TomichiteHide

Other Language Names for TomichiteHide

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

Common AssociatesHide

Associations Based on Photo Data:
1 photo of Tomichite associated with PyriteFeS2

Related Minerals - Strunz-mindat GroupingHide

4.JB.CuyaiteCa2Mn3+As3+14O24ClMon. m
4.JB.BrattforsiteMn19(AsO 3)12Cl2Mon. 2/m : B2/b
4.JB.05Fetiasite(Fe3+,Fe2+,Ti)3(As2O5)O2Mon. 2/m : P21/m
4.JB.10ManganarsiteMn3(As2O4)(OH)4Trig.
4.JB.15'UM1984-09-AsO:ClHMn'Mn10As6O18(OH)ClTet. 4/mmm (4/m 2/m 2/m) : I41/acd
4.JB.15MagnussoniteMn2+10(As3+O3)6(OH,Cl)2Iso. m3m (4/m 3 2/m) : Ia3d
4.JB.20ArmangiteMn2+26(AsO3)14(HAsO3)4(CO3)Trig. 3 : P3
4.JB.25NanlingiteNa(Ca5Li)Mg12(AsO3)2[Fe(AsO3)6]F14Trig. 3m (3 2/m) : R3m
4.JB.30AsbecasiteCa3(Ti,Sn4+)Be2(AsO3)6(SiO4)2Trig. 3m : P3c1
4.JB.35StenhuggariteCaFeSb(AsO3)2OTet. 4/mmm (4/m 2/m 2/m) : I41/amd
4.JB.40TrigonitePb3Mn2+(AsO3)2(HAsO3)Mon. m
4.JB.45FinnemanitePb5(AsO3)3ClHex. 6/m : P63/m
4.JB.50GebharditePb8(As2O5)2OCl6Mon. 2/m : P21/b
4.JB.55GraeseriteFe3+4Ti3As3+O13(OH)Mon. 2/m : B2/m
4.JB.55DerbyliteFe3+4Ti3Sb3+O13(OH)Mon. 2/m : P21/m
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.70GeorgiadesitePb4(As3+O3)Cl4(OH)Mon. 2/m : P21/b
4.JB.75Szklaryite◻Al6BAs3+3O15Orth. mmm (2/m 2/m 2/m) : Pbcm
4.JB.75Ekatite(Fe3+,Fe2+,Zn)12(AsO3)6(AsO3,HSiO4)2(OH)6Hex. 6mm : P63mc
4.JB.85LepageiteMn2+3(Fe3+7Fe2+4)O3[Sb3+5As3+8O34]Tric. 1 : P1
4.JB.90BianchiniiteBa2(TiV)(As2O5)2OFTet. 4/mmm (4/m 2/m 2/m) : I4/mcm

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.

Internet Links for TomichiteHide

References for TomichiteHide

Localities for TomichiteHide

Showing 3 localities.

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.
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Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Australia
 
  • Western Australia
    • Kalgoorlie-Boulder Shire
      • Kalgoorlie-Boulder
        • Kalgoorlie Consolidated Gold Mines
Grey et al. (1981)
MM 1980
Canada
 
  • Ontario
    • Thunder Bay District
      • Bomby Township
Harris et al. (1988)
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