Colchesterite
A valid IMA mineral species - pending publication
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David Colchester
Formula:
Bi3+2Mo6+2O9
Crystal System:
Monoclinic
Name:
After David Colchester
Type Locality:
New structure type.
Chemically similar to koechlinite and sardignaite; and to the (otherwise Mo5+-bearing species) gelosaite and mambertiite.
Chemically similar to koechlinite and sardignaite; and to the (otherwise Mo5+-bearing species) gelosaite and mambertiite.
Unique Identifiers
Mindat ID:
470887
Long-form identifier:
mindat:1:1:470887:8
IMA Classification of Colchesterite
Classification of Colchesterite
4.DE.
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
E : With medium-sized cations; with various polyhedra
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
E : With medium-sized cations; with various polyhedra
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 |
|---|---|---|
| Cchs | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Chemistry of Colchesterite
Mindat Formula:
Bi3+2Mo6+2O9
Element Weights:
Elements listed:
Crystallography of Colchesterite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 8.103(2) Å, b = 8.540(2) Å, c = 11.209(2) Å
β = 93.58(3)°
β = 93.58(3)°
Ratio:
a:b:c = 0.949 : 1 : 1.313
Unit Cell V:
774.14 ų (Calculated from Unit Cell)
Comment:
Space Group: P2/n
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.83 Å | (20) |
| 3.995 Å | (21) |
| 3.560 Å | (100) |
| 3.210 Å | (27) |
| 3.151 Å | (22) |
| 2.657 Å | (30) |
| 2.208 Å | (19) |
| 1.954 Å | (25) |
Type Occurrence of Colchesterite
Place of Conservation of Type Material:
Collections of the South Australian Museum, North Terrace, Adelaide, South Australia 5000, Australia, registration number G35359
Other Language Names for Colchesterite
Dutch:Colchesteriet
German:Colchesterit
Related Minerals - Strunz-mindat Grouping
| 4.DE. | Pertoldite | GeO2 |
| 4.DE. | Ziroite | ZrO2 |
| 4.DE.05 | Downeyite | SeO2 |
| 4.DE.10 | Koragoite | (Mn2+,Fe3+)3(Nb,Ta,Ti)2(Nb,Mn)2(W,Ta)2O20 |
| 4.DE.15 | Russellite | Bi2WO6 |
| 4.DE.15 | Koechlinite | Bi2MoO6 |
| 4.DE.15 | Tungstibite | Sb3+2WO6 |
| 4.DE.20 | Tellurite | TeO2 |
| 4.DE.25 | Paratellurite | TeO2 |
| 4.DE.30 | Bismutotantalite | BiTaO4 |
| 4.DE.30 | Stibiotantalite | Sb(Ta,Nb)O4 |
| 4.DE.30 | Cervantite | Sb3+Sb5+O4 |
| 4.DE.30 | Bismutocolumbite | Bi(Nb,Ta)O4 |
| 4.DE.30 | Stibiocolumbite | Sb(Nb,Ta)O4 |
| 4.DE.30 | Clinocervantite | Sb3+Sb5+O4 |
| 4.DE.35 | Baddeleyite | ZrO2 |
| 4.DE.40 | Billwiseite | Sb3+5Nb3WO18 |
| 4.DE.45 | Kyawthuite | Bi3+Sb5+O4 |
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 Colchesterite
mindat.org URL:
https://www.mindat.org/min-470887.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
References for Colchesterite
Localities for Colchesterite
symbol to view information about a locality.
The 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).
All localities listed without proper references should be considered as questionable.
Australia (TL) | |
| Bosi et al. (2023) |