Tomichite
A valid IMA mineral species
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About Tomichite
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.
V analogue of graeserite. VAs analogue of derbylite.
Note: space groups of the 3 species may differ.
Note: space groups of the 3 species may differ.
Unique Identifiers
Mindat ID:
3993
Long-form identifier:
mindat:1:1:3993:8
GUID
(UUID V4):
(UUID V4):
a129c532-1e86-4f53-b713-f802a8aa0f7c
IMA Classification of Tomichite
Approved
IMA Formula:
V3+4Ti4+3As3+O13(OH)
Approval year:
1978
First published:
1979
Classification of Tomichite
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
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
46 : ANTIMONITES AND ARSENITES CONTAINING HYDROXYL OR HALOGEN
2 : Miscellaneous
23.22
23 : Arsenites
23 : Arsenites
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Tom | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Tomichite
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 Tomichite
Anisotropism:
Moderate
Reflectivity:
Wavelength | R |
---|---|
470nm | 15.9% |
546nm | 16.3% |
589nm | 16.6% |
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
Chemistry of Tomichite
Mindat Formula:
(V,Fe)4Ti3AsO13(OH)
Crystallography of Tomichite
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°
β = 105.05°
Ratio:
a:b:c = 0.5 : 1 : 0.352
Unit Cell V:
485.49 ų (Calculated from Unit Cell)
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0001066 | Tomichite | Grey 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 72 201-208 | 1987 | 0 | 293 | ||
0001067 | Tomichite | Grey 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 72 201-208 | 1987 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
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 Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 5: Initiation of plate tectonics | <3.5-2.5 |
40 : Regional metamorphism (greenschist, amphibolite, granulite facies) | |
Stage 7: Great Oxidation Event | <2.4 |
47a : [Near-surface hydration of prior minerals] | |
47d : [Arsenates, antimonates, selenates, bismuthinates] | |
47e : [Vanadates, chromates, manganates] |
Type Occurrence of Tomichite
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.
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 Tomichite
Other Language Names for Tomichite
Common Associates
Related Minerals - Strunz-mindat Grouping
4.JB. | Cuyaite | Ca2Mn3+As3+14O24Cl |
4.JB. | Brattforsite | Mn19(AsO 3)12Cl2 |
4.JB.05 | Fetiasite | (Fe3+,Fe2+,Ti)3(As2O5)O2 |
4.JB.10 | Manganarsite | Mn3(As2O4)(OH)4 |
4.JB.15 | Magnussonite | Mn2+10(As3+O3)6(OH,Cl)2 |
4.JB.15 | UM1984-09-AsO:ClHMn | Mn10As6O18(OH)Cl |
4.JB.20 | Armangite | Mn2+26(AsO3)14(HAsO3)4(CO3) |
4.JB.25 | Nanlingite | Na(Ca5Li)Mg12(AsO3)2[Fe(AsO3)6]F14 |
4.JB.30 | Asbecasite | Ca3(Ti,Sn4+)Be2(AsO3)6(SiO4)2 |
4.JB.35 | Stenhuggarite | CaFeSb(AsO3)2O |
4.JB.40 | Trigonite | Pb3Mn2+(AsO3)2(HAsO3) |
4.JB.45 | Finnemanite | Pb5(AsO3)3Cl |
4.JB.50 | Gebhardite | Pb8(As2O5)2OCl6 |
4.JB.55 | Derbylite | Fe3+4Ti3Sb3+O13(OH) |
4.JB.55 | Graeserite | Fe3+4Ti3As3+O13(OH) |
4.JB.60 | Hemloite | (Ti,V3+,Fe3+,Al)12(As3+,Sb3+)2O23(OH) |
4.JB.65 | Freedite | Cu+Pb8(AsO3)2O3Cl5 |
4.JB.70 | Georgiadesite | Pb4(As3+O3)Cl4(OH) |
4.JB.75 | Ekatite | (Fe3+,Fe2+,Zn)12(AsO3)6(AsO3,HSiO4)2(OH)6 |
4.JB.75 | Szklaryite | ◻Al6BAs3+3O15 |
4.JB.85 | Lepageite | Mn2+3(Fe3+7Fe2+4)O3[Sb3+5As3+8O34] |
4.JB.90 | Bianchiniite | Ba2(TiV)(As2O5)2OF |
Other Information
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 Tomichite
mindat.org URL:
https://www.mindat.org/min-3993.html
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References for Tomichite
Localities for Tomichite
Locality List
- 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.
All localities listed without proper references should be considered as questionable.
Australia | |
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Canada | |
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