Meymacite
A valid IMA mineral species - grandfathered
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About Meymacite
Formula:
WO3 · 2H2O
Colour:
Yellow-brown
Lustre:
Vitreous, Resinous
Specific Gravity:
3.94 - 4.10
Crystal System:
Amorphous
Name:
Named for the town of Meymac, France. The original substance named meymacite was later found to be ferritungstite. However the name was then reused for this new mineral found in both Zaïre and at Meymac. This redifinition was by R. Pierrot and R. van Tassel in 1965.
Type Locality:
Dimorph of:
An amorphous hydrated tungsten oxide.
Unique Identifiers
Mindat ID:
2700
Long-form identifier:
mindat:1:1:2700:3
GUID
(UUID V4):
(UUID V4):
e0d30603-1f8a-4647-95e4-598dbc439782
IMA Classification of Meymacite
Approved, 'Grandfathered' (first described prior to 1959)
Classification of Meymacite
4.FJ.05
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
J : Hydroxides with H2O +- (OH); corner-sharing octahedra
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
J : Hydroxides with H2O +- (OH); corner-sharing octahedra
4.5.3.1
4 : SIMPLE OXIDES
5 : AX3
4 : SIMPLE OXIDES
5 : AX3
7.15.7
7 : Oxides and Hydroxides
15 : Oxides of Mo and W
7 : Oxides and Hydroxides
15 : Oxides of Mo and W
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 |
|---|---|---|
| Mym | 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 Meymacite
Vitreous, Resinous
Transparency:
Translucent
Colour:
Yellow-brown
Fracture:
Conchoidal
Density:
3.94 - 4.10 g/cm3 (Measured)
Chemistry of Meymacite
Mindat Formula:
WO3 · 2H2O
Elements listed:
Crystallography of Meymacite
Crystal System:
Amorphous
Comment:
Amourphous
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| - Å | () |
Comments:
Amorphous or nearly amporphous.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] |
Type Occurrence of Meymacite
Place of Conservation of Type Material:
Ecole Nationale Supérieure des Mines, Paris, France (cotype).
Reference:
van Tassel, R. (1961) Ferritungstite et meymacite de Meymac, France, et d'Afrique centrale. Bulletin de la Societé belge de Géologie: 70: 376-399.
Synonyms of Meymacite
Other Language Names for Meymacite
Spanish:Meyamacita
Meymacita
Meymacita
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 4.FJ. | Raydemarkite | MoO3 · H2O |
| 4.FJ.05 | Sidwillite | MoO3 · 2H2O |
| 4.FJ.10 | Tungstite | WO3 · H2O |
| 4.FJ.15 | Hydrotungstite | WO3 · 2H2O |
| 4.FJ.15 | Ilsemannite | Mo3O8 · nH2O |
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 Meymacite
mindat.org URL:
https://www.mindat.org/min-2700.html
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External Links:
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References for Meymacite
Reference List:
Localities for Meymacite
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.
DR Congo (TL) | |
| Bull.Soc.fr.Min.Crist. (1965) |
France | |
| R. van Tassel (1961) |
| Ansermet et al. (2010) | |
| Lebocey et al. (2010) | |
Germany | |
| Walenta (1992) |
Italy | |
| Mattioli (1979) +1 other reference |
| Lovisato D. (1907) |
Malaysia | |
| Färber (n.d.) | |
Portugal | |
| Exemplares no Museu Alfredo Bensaude |
Rwanda | |
| Dewaele et al. (2016) |
Spain | |
| Bocamina (Grupo Mineralogista de Madrid) |
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Clara Mine, Oberwolfach, Ortenaukreis, Freiburg Region, Baden-Württemberg, Germany