Colchesterite

Bi3+2Mo6+2O9
IMA status
  • Approved
  • Pending publication
IMA symbol
Cchs
IMA approved
2023
Also known as
  • Colchesteriet

Where it forms, where it's found

Type locality
Kingsgate
  1. Gough Co.
  2. New South Wales
  3. Australia

-29.8179°, 151.9728°

1recorded occurrences
Source · OpenStreetMap

Crystallography

Crystal system
Monoclinic
Cell parameters
a = 8.103(2) Å · b = 8.540(2) Å · c = 11.209(2) Å
Cell angles
β = 93.58(3) °
Ratio a:b:c
1 : 1.054 : 1.383
Comment

Space Group: P2/n

Chemical composition

Constituent elements
Mass composition breakdown
ElementAtoms At. mass g/mol Mass g/molMass share
83BiBismuthBismuth2208.980417.960
55.44%
42MoMolybdenumMolybdenum295.950191.900
25.46%
8OOxygenOxygen915.999143.991
19.10%
Total753.851100.00%

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

From Mindat formula

Synonyms

  • Colchesteriet

In other languages

German
Colchesterit · IMA 2023-053

Classification

Strunz
10th ed.

4.DE

  • 4OxidesClass
  • 4.DMetal: Oxygen = 1:2 and similarDivision
  • 4.DEWith medium-sized cations; with various polyhedraGroup
  • 4.DEColchesteriteSpecies

Literature, links & citation

Citations
  1. 2023Bosi, Ferdinando, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2023) Newsletter 75. Mineralogical Magazine, 1-4 doi:10.1180/mgm.2023.76DOI: 10.1180/mgm.2023.76
Cite this entry
@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Colchesterite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/colchesterite-470887},
  note      = {Accessed 2026-05-11}
}