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Ursilite

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Formula:
Mg4(UO2)4(Si2O5)5.5(OH)5 · 13H2O
Colour:
Light yellow, straw-yellow
Lustre:
Vitreous, Silky
Hardness:
2 - 3
Specific Gravity:
3.25 (Calculated)
Crystal System:
Orthorhombic
Name:
The name reflects the URANium and SILicon content
The original publication considered two varieties: calcium ursilite ("almost pure Ca-U-silicate") and magnesium ursilite (("almost pure Mg-U-silicate").
A reinvestigation and crystal-structure study seems necessary.


Classification of Ursilite

Approved, 'Grandfathered' (first described prior to 1959)
9.AK.35

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

Physical Properties of Ursilite

Vitreous, Silky
Colour:
Light yellow, straw-yellow
Hardness:
2 - 3 on Mohs scale
Density:
3.25 g/cm3 (Calculated)

Optical Data of Ursilite

Type:
Biaxial (-)
RI values:
nα = 1.570 nγ = 1.584
Max Birefringence:
δ = 0.014
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of Ursilite

Formula:
Mg4(UO2)4(Si2O5)5.5(OH)5 · 13H2O
IMA Formula:
Mg4(UO2)4(Si2O5)5.5(OH)5 · 13H2O

Crystallography of Ursilite

Crystal System:
Orthorhombic
Cell Parameters:
a = 11.60 Å, b = 14.68 Å, c = 12.83 Å
Ratio:
a:b:c = 0.79 : 1 : 0.874
Unit Cell V:
2,184.80 ų (Calculated from Unit Cell)
Z:
6
Morphology:
Needlelike crystals (only visible in SEM)

Type Occurrence of Ursilite

Synonyms of Ursilite

Other Language Names for Ursilite

Varieties of Ursilite

Related Minerals - Nickel-Strunz Grouping

9.AK.05Soddyite(UO2)2SiO4 · 2H2O
9.AK.10CuprosklodowskiteCu(UO2)2(SiO3OH]2 · 6H2O
9.AK.10OursiniteCo(UO2)2(SiO3OH)2 · 6H2O
9.AK.10SklodowskiteMg(UO2)2(SiO3OH)2 · 6H2O
9.AK.15Boltwoodite(K,Na)(UO2)(SiO3OH) · 1.5H2O
9.AK.15KasolitePb(UO2)[SiO4] · H2O
9.AK.15NatroboltwooditeNa(UO2)(SiO3OH) · H2O
9.AK.15Uranophane-βCa(UO2)2(SiO3OH)2 · 5H2O
9.AK.15UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
9.AK.15Beta-UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
9.AK.20Swamboite-(Nd)Nd0.333[(UO2)(SiO3OH)](H2O)∼2.5
9.AK.25HaiweeiteCa(UO2)2[Si5O12(OH)2] · 6H2O
9.AK.25MetahaiweeiteCa(UO2)2Si6O15 · nH2O
9.AK.25RanquiliteCa(UO2)2[Si5O12(OH)2] · 6H2O
9.AK.30WeeksiteK2(UO2)2(Si5O13) · 4H2O
9.AK.30CoutinhoiteThxBa(1-2x)(UO2)2Si5O13 · (H2O)1+y (0 < x < 0.5 and 0 < y < (2+x))
9.AK.35MagnioursiliteMg4(UO2)4(Si2O5)5(OH)6 · 20H2O
9.AK.35CalcioursiliteCa4(UO2)4(Si2O5)5(OH)6 · 15H2O
9.AK.40UranosiliteUO3 · 7SiO2

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.

References for Ursilite

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Chernikov A A, Krumetskaia O V, Sidel'nikova V D (1957): Ursilite - a new silicate of uranium. Atomnaya Energiya Voprosy Geologii Urana, Supplement 6, 61-65.
Chernikov A A, Krutetskaya O V, Sidelnikova V D (1957): Ursilite - a new silicate of uranium. Atomnaya Energiya Voprosy Geologii Urana, Supplement 6, 73-77 (in Russian).
Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva (1977): 106: 553-564.

Internet Links for Ursilite

mindat.org URL:
https://www.mindat.org/min-4119.html
Please feel free to link to this page.

Localities for Ursilite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Afghanistan
 
  • Helmand Province (Hilmend Province; Hilmand Province)
    • Dushan District
      • Khanneshin complex
Orris, G.J., and Bliss, J.D. (2002): Mines and Mineral Occurrences of Afghanistan. United States Geological Survey Open-File Report 02-110
Romania
 
  • Suceava Co.
    • Suceava district
Hîrtopanu P., Udubaşa G., Scott P., Hârtopanu I. (2004) Uranium sulphide mineralisation in the Bistriţa Mts., East Carpathians, Romania. Romanian Journal of Mineral Deposits 81:108-111
Tajikistan
 
  • Region of Republican Subordination
    • Tien Shan Mtn
      • Alai Range (Alayskiy)
http://www.koeln.netsurf.de/~w.steffens/dara.htm
  • Viloyati Sogd (Viloyati Sughd; Viloyati Khodzhent; Viloyati Leninabad)
    • Khodzhent (Leninabad)
      • Kyzyltyube-Sai
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
Mineral and/or Locality  
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