Calcioursilite
A valid IMA mineral species - grandfathered
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About Calcioursilite
Formula:
Ca4(UO2)4(Si2O5)5(OH)6 · 15H2O
Colour:
Lemon yellow
Lustre:
Earthy
Crystal System:
Orthorhombic
Name:
For chemical composition: Uranyl and calcium silicate.
Calcioursilite was originally described in 1957 as “ursilite” (now discredited) from the Oktyabr’skoye deposit, Kyzyltyube-Saj, Samgar Steppe, Tajikistan.
Forms a solid solution with magnioursilite.
Chemically similar to uranophane and its dimorph parauranophane, but with different stoichiometry.
Forms a solid solution with magnioursilite.
Chemically similar to uranophane and its dimorph parauranophane, but with different stoichiometry.
Unique Identifiers
Mindat ID:
11360
Long-form identifier:
mindat:1:1:11360:1
GUID
(UUID V4):
(UUID V4):
1efc6d7e-0183-4b19-aa2e-64b304ab3d0c
IMA Classification of Calcioursilite
Approved, 'Grandfathered' (first described prior to 1959)
First published:
1957
Classification of Calcioursilite
9.AK.35
9 : SILICATES (Germanates)
A : Nesosilicates
K : Uranyl neso- and polysilicates
9 : SILICATES (Germanates)
A : Nesosilicates
K : Uranyl neso- and polysilicates
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 |
|---|---|---|
| Caur | 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 Calcioursilite
Earthy
Colour:
Lemon yellow
Chemistry of Calcioursilite
Mindat Formula:
Ca4(UO2)4(Si2O5)5(OH)6 · 15H2O
Crystallography of Calcioursilite
Crystal System:
Orthorhombic
Cell Parameters:
a = 14.09(6) Å, b = 17.87(1) Å, c = 18.24 Å
Ratio:
a:b:c = 0.788 : 1 : 1.021
Unit Cell V:
4,592.62 ų (Calculated from Unit Cell)
Comment:
Poorly defined crystallography
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47f : [Uranyl (U⁶⁺) minerals] |
Type Occurrence of Calcioursilite
General Appearance of Type Material:
Forms acicular crystals, spherulites and earthy masses.
Place of Conservation of Type Material:
n.d.
Geological Setting of Type Material:
Forms in granite-porphyry.
Associated Minerals at Type Locality:
Synonyms of Calcioursilite
Ursilite (in part)
Other Language Names for Calcioursilite
German:Calcioursilit
Ca-ursilit
Ca-ursilit
Spanish:Calcioursilita
Common Associates
Associated Minerals Based on Photo Data:
| 1 photo of Calcioursilite associated with Uranophane | Ca(UO2)2(SiO3OH)2 · 5H2O |
Related Minerals - Strunz-mindat Grouping
| 9.AK. | Orlite | Pb3(UO2)3(Si2O7)2 · 6H2O |
| 9.AK.05 | Soddyite | (UO2)2SiO4 · 2H2O |
| 9.AK.10 | Cuprosklodowskite | Cu(UO2)2(SiO3OH)2 · 6H2O |
| 9.AK.10 | Oursinite | Co(UO2)2(SiO3OH)2 · 6H2O |
| 9.AK.10 | Sklodowskite | Mg(UO2)2(SiO3OH)2 · 6H2O |
| 9.AK.15 | Boltwoodite | (K,Na)(UO2)(SiO3OH) · 1.5H2O |
| 9.AK.15 | Kasolite | Pb(UO2)(SiO4) · H2O |
| 9.AK.15 | Natroboltwoodite | Na(UO2)(SiO3OH) · H2O |
| 9.AK.15 | Parauranophane | Ca(UO2)2(SiO3OH)2 · 5H2O |
| 9.AK.15 | Uranophane | Ca(UO2)2(SiO3OH)2 · 5H2O |
| 9.AK.20 | Swamboite-(Nd) | Nd0.333[(UO2)(SiO3OH)](H2O)~2.5 |
| 9.AK.25 | Haiweeite | Ca(UO2)2[Si5O12(OH)2] · 6H2O |
| 9.AK.25 | Metahaiweeite | Ca(UO2)2Si6O15 · nH2O |
| 9.AK.30 | Weeksite | K2(UO2)2(Si5O13) · 4H2O |
| 9.AK.30 | Coutinhoite | ThxBa(1-2x)(UO2)2Si5O13 · (H2O)1+y (0 < x < 0.5 and 0 < y < (2+x)) |
| 9.AK.35 | Magnioursilite | Mg4(UO2)4(Si2O5)5(OH)6 · 20H2O |
| 9.AK.40 | Uranosilite | UO3 · 7SiO2 |
Fluorescence of Calcioursilite
Distinctly fluorescent in greenish yellow under ultraviolet light.
Other Information
Notes:
Easily soluble in acids (especially when warm), turning the solution green and yielding silica gel.
During heating, the water is driven off and the mineral becomes black.
During heating, the water is driven off and the mineral becomes black.
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 Calcioursilite
mindat.org URL:
https://www.mindat.org/min-11360.html
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Please feel free to link to this page.
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References for Calcioursilite
Reference List:
Localities for Calcioursilite
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.
Tajikistan | |
| In the collection of Brent Thorne. ... |
| ZVMO (1977) +1 other reference |
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Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan