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Calcioursilite

A valid IMA mineral species - grandfathered
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About CalcioursiliteHide

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.


Unique IdentifiersHide

Mindat ID:
11360
Long-form identifier:
mindat:1:1:11360:1
GUID
(UUID V4):
1efc6d7e-0183-4b19-aa2e-64b304ab3d0c

IMA Classification of CalcioursiliteHide

Approved, 'Grandfathered' (first described prior to 1959)
First published:
1957

Classification of CalcioursiliteHide

9.AK.35

9 : SILICATES (Germanates)
A : Nesosilicates
K : Uranyl neso- and polysilicates

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
CaurIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of CalcioursiliteHide

Earthy
Colour:
Lemon yellow

Chemistry of CalcioursiliteHide

Mindat Formula:
Ca4(UO2)4(Si2O5)5(OH)6 · 15H2O

Crystallography of CalcioursiliteHide

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 EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 7: Great Oxidation Event<2.4
47a : [Near-surface hydration of prior minerals]
47f : [Uranyl (U⁶⁺) minerals]

Type Occurrence of CalcioursiliteHide

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 CalcioursiliteHide

Other Language Names for CalcioursiliteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
1 photo of Calcioursilite associated with UranophaneCa(UO2)2(SiO3OH)2 · 5H2O

Related Minerals - Strunz-mindat GroupingHide

9.AK.OrlitePb3(UO2)3(Si2O7)2 · 6H2O
9.AK.05Soddyite(UO2)2SiO4 · 2H2OOrth. mmm (2/m 2/m 2/m) : Fddd
9.AK.10CuprosklodowskiteCu(UO2)2(SiO3OH)2 · 6H2OTric. 1 : P1
9.AK.10OursiniteCo(UO2)2(SiO3OH)2 · 6H2OOrth. mmm (2/m 2/m 2/m) : Cmca
9.AK.10SklodowskiteMg(UO2)2(SiO3OH)2 · 6H2OMon. 2/m : B2/m
9.AK.15Boltwoodite(K,Na)(UO2)(SiO3OH) · 1.5H2OMon. 2 : P21
9.AK.15KasolitePb(UO2)(SiO4) · H2OMon. 2/m : P21/b
9.AK.15NatroboltwooditeNa(UO2)(SiO3OH) · H2OOrth. 2 2 2 : P21 21 21
9.AK.15ParauranophaneCa(UO2)2(SiO3OH)2 · 5H2OMon. 2/m : P21/b
9.AK.15UranophaneCa(UO2)2(SiO3OH)2 · 5H2OMon. 2 : P21
9.AK.20Swamboite-(Nd)Nd0.333[(UO2)(SiO3OH)](H2O)~2.5Mon. 2/m : P21/b
9.AK.25HaiweeiteCa(UO2)2[Si5O12(OH)2] · 6H2OOrth. mmm (2/m 2/m 2/m) : Pbcn
9.AK.25MetahaiweeiteCa(UO2)2Si6O15 · nH2OMon. 2/m : P2/b
9.AK.30WeeksiteK2(UO2)2(Si5O13) · 4H2OMon. 2/m : B2/m
9.AK.30CoutinhoiteThxBa(1-2x)(UO2)2Si5O13 · (H2O)1+y (0 < x < 0.5 and 0 < y < (2+x))Orth. mmm (2/m 2/m 2/m)
9.AK.35MagnioursiliteMg4(UO2)4(Si2O5)5(OH)6 · 20H2O
9.AK.40UranosiliteUO3 · 7SiO2Orth.

Fluorescence of CalcioursiliteHide

Distinctly fluorescent in greenish yellow under ultraviolet light.

Other InformationHide

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.
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 CalcioursiliteHide

References for CalcioursiliteHide

Localities for CalcioursiliteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Tajikistan
 
  • Districts of Republican Subordination
In the collection of Brent Thorne. ...
  • Sughd
    • Khodzhent (Leninabad)
      • Kyzyltyube-Sai
ZVMO (1977) +1 other reference
 
矿物 and/or 产地  
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