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UM1981-26-SiO:CaU
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Formula:
~(Ca,K,Mg)U3Si11O29 (?)
Hardness:
5
One of four Ca-U4+ silicate species from Žirovsky Vrh deposit, Slovenia (and likely also from Forstau, Salzburg, Austria). Corresponds to "Group 5" microprobe analyses. The species occur as irregular to equant grains, black to gray to lighter gray in colour. Associated with coffinite. Compare UM1981-24-SiO:CaU, UM1981-25-SiO:CaU, UM1981-28-SiO:CaU and 'UM1982-17-SiO:CaTiU'.
The chemical analysis total is slighly too low (second analysis after normalization to 100% is given in the abstract) - maybe water is also present?
Compare arapovite - the only approved Ca- and U4+-bearing silicate mineral.
The chemical analysis total is slighly too low (second analysis after normalization to 100% is given in the abstract) - maybe water is also present?
Compare arapovite - the only approved Ca- and U4+-bearing silicate mineral.
Unique Identifiers
Mindat ID:
47581
Long-form identifier:
mindat:1:1:47581:1
Similar Names
| UM1956-02-SiO:CaHU | CaUSiO6 · H2O | |
| UM1960-07-SiO:CaHU | Ca-U-Si-O-H | |
| UM1977-14-SiO:CaH | Ca2SiO4 · H2O | |
| UM1981-24-SiO:CaU | ~(Ca,K,Ba)U8Si2O21 | |
| UM1981-25-SiO:CaU | ~(Ca,Mg,K,Ba)U7Si4O21 | |
| UM1981-28-SiO:CaU | ~(Ca,K,Ba)U5Si11O33 | |
| UM1997-50-SiO:CaHU | Valid as an unnamed mineral | Ca2(UO2)2(Si2O5)3 · 10H2O |
| UM1999-34-SiO:Ca | A synonym of Breyite | |
| UM1999-35-SiO:Ca | Valid as an unnamed mineral | CaSi2O5 |
| UM2001-23-SiO:CaHU | Valid as an unnamed mineral | Ca(UO2)2(SiO3OH)2 · 5H2O |
| UM2005-31-SiO:CuH | Valid as an unnamed mineral | Cu11(SiO4)(OH)18 · 9H2O (?) |
Physical Properties of UM1981-26-SiO:CaU
Hardness:
5 on Mohs scale
Chemistry of UM1981-26-SiO:CaU
Mindat Formula:
~(Ca,K,Mg)U3Si11O29 (?)
Radioactivity
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 UM1981-26-SiO:CaU
mindat.org URL:
https://www.mindat.org/min-47581.html
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References for UM1981-26-SiO:CaU
Reference List:
Simova, F.G. (1981): Uranium silicates from two deposits in Permian sediments, Central Europe. Bulgarska Akademia Nauk, Sofia, Doklady: 34(12): 1693-1696(Abs. in: Dunn, P.J., Grice, J.G., Fleischer, M., Pabst, A. (1983): New mineral names. American Mineralogist: 68: 1041)
Localities for UM1981-26-SiO:CaU
Showing 2 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ā - 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.
Austria | |
| Simova (1981) +1 other reference |
Slovenia | |
| Simova (1981) +1 other reference |
