Kimrobinsonite

Ta(OH)3(O,CO3)
IMA status
  • Approved
IMA symbol
Kim
Discovered
1983
IMA approved
1983
Also known as
  • IMA1983-023
  • Kimrobinsoniet

Where it forms, where it's found

Type locality
Forrestania Rubellite pegmatite
  1. Mount Holland pegmatite field
  2. Yilgarn shire
  3. Western Australia
  4. Australia

-32.1874°, 119.7949°

2recorded occurrences
Source · OpenStreetMap

Physical

Hardness
123456789102.5/ 10 MOHS
  1. 1Talc
  2. 2Gypsum
  3. 3Calcite
  4. 4Fluorite
  5. 5Apatite
  6. 6Orthoclase
  7. 7Quartz
  8. 8Topaz
  9. 9Corundum
  10. 10Diamond
Colour
White · lemon
Streak
White

Crystallography

Crystal system
Isometric
Cell parameters
a = 3.812(1) Å
Morphology

In masses of cryptocrystalline individuals.

Comment

Point group not determined.

Chemical composition

Constituent elements
Mass composition breakdown
ElementAtoms At. mass g/mol Mass g/molMass share
73TaTantalumTantalum1180.948180.948
58.75%
8OOxygenOxygen715.999111.993
36.37%
6CCarbonCarbon112.01112.011
3.90%
1HHydrogenHydrogen31.0083.024
0.98%
Total307.976100.00%

Mass share = atoms × atomic mass ÷ molar mass × 100

From IMA formula

Synonyms

  • IMA1983-023
  • Kimrobinsoniet

In other languages

German
IMA 1983-023 · Kimrobinsonit
Italian
Kimrobinsonite

Classification

Strunz
10th ed.

4.FG.15

  • 4OxidesClass
  • 4.FHydroxides (without V or U)Division
  • 4.FGHydroxides with OH, without H2O; unclassifiedGroup
  • 4.FG.15KimrobinsoniteSpecies
Dana
8th ed.

06.04.08.01

  • 06Hydroxides and Oxides Containing HydroxylClass
  • 06.04MiscellaneousType
  • 06.04.08— unnamed intermediate level —Group
  • 06.04.08.01KimrobinsoniteSpecies
CIM

7.12.23

  • 7Oxides and HydroxidesClass
  • 7.12Oxides of V, Nb and TaGroup
  • 7.12.23KimrobinsoniteSpecies

Group, growth & confusion

Often grow together
1 mineral

Literature, links & citation

Citations
  1. 1985Nickel, E. H., Robinson, B. W. (1985) Kimrobinsonite, a new tantalum mineral from Western Australia, and its association with cesstibtantite. The Canadian Mineralogist, 23 (4) 573-576
  2. 1987American Mineralogist (1987): 72: 1024.
  3. 2005(2005) Kimrobinsonite. Handbook of Mineralogy. Mineralogical Society of America
Cite this entry
@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Kimrobinsonite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/kimrobinsonite-2207},
  note      = {Accessed 2026-05-11}
}