Mindat Logo

Ursilite

This page is currently not sponsored. Click here to sponsor this page.



Formula:
(Mg,Ca)
 
4
(UO
 
2
)
 
4
(Si
 
2
O
 
5
)
 
5.5
(OH)
 
5
· 13H
 
2
O
System:OrthorhombicColour:Light yellow, ...
Lustre:Vitreous, SilkyHardness:2 - 3
Name:The name reflects the URANium and SILicon content
This page provides mineralogical data about Ursilite.

Classification of Ursilite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:8/B.37-10
Nickel-Strunz 10th (pending) edition ID:9.AK.35

9 : SILICATES (Germanates)
A : Nesosilicates
K : Uranyl neso- and polysilicates
mindat.org URL:http://www.mindat.org/min-4119.html
Please feel free to link to this page.

Type Occurrence of Ursilite

Type Locality:Oktyabr'skoye U Deposit, Kyzyltyube-Sai, Khodzhent (Leninabad), Viloyati Sogd (Viloyati Sughd; Viloyati Khodzhent; Viloyati Leninabad), Tajikistan

Occurrences of Ursilite

Geological Setting:Uranium deposit

Physical Properties of Ursilite

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

Crystallography of Ursilite

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

Optical Data of Ursilite

Type:Biaxial (-)
RI values: nα = 1.570 nγ = 1.584
Maximum Birefringence:δ = 0.014

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate

Chemical Properties of Ursilite

Formula:
(Mg,Ca)
 
4
(UO
 
2
)
 
4
(Si
 
2
O
 
5
)
 
5.5
(OH)
 
5
· 13H
 
2
O
Simplified for copy/paste:(Mg,Ca)4(UO2)4(Si2O5)5.5(OH)5·13H2O
Essential elements:H, Mg, O, Si, U
All elements listed in formula:Ca, H, Mg, O, Si, U

Relationship of Ursilite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.AK.05Soddyite
(UO
 
2
)
 
2
SiO
 
4
· 2H
 
2
O
9.AK.10Cuprosklodowskite
Cu(UO
 
2
)
 
2
[HSiO
 
4
]
 
2
· 6H
 
2
O
9.AK.10Oursinite
(Co,Mg)(UO
 
2
)
 
2
[HSiO
 
4
]
 
2
· 6H
 
2
O
9.AK.10Sklodowskite
Mg(UO
 
2
)
 
2
[HSiO
 
4
]
 
2
· 5H
 
2
O
9.AK.15Boltwoodite
(K,Na)(UO
 
2
)[HSiO
 
4
] · 0.5H
 
2
O
9.AK.15Kasolite
Pb(UO
 
2
)[SiO
 
4
] · H
 
2
O
9.AK.15Natroboltwoodite
(H
 
3
O)(Na,K)UO
 
2
SiO
 
4
· H
 
2
O
9.AK.15Uranophane-β
Ca(UO
 
2
)
 
2
(HSiO
 
4
)
 
2
· 5H
 
2
O
9.AK.15Uranophane
Ca(UO
 
2
)
 
2
[HSiO
 
4
]
 
2
· 5H
 
2
O
9.AK.15Beta-Uranophane
9.AK.20Swamboite
UH
 
6
(UO
 
2
)
 
6
(SiO
 
4
)
 
6
· 30H
 
2
O
9.AK.25Haiweeite
Ca(UO
 
2
)
 
2
[Si
 
5
O
 
12
(OH)
 
2
] · 6H
 
2
O
9.AK.25Metahaiweeite
Ca(UO
 
2
)
 
2
Si
 
6
O
 
15
· nH
 
2
O
9.AK.25Ranquilite
9.AK.30Weeksite
K
 
2
(UO
 
2
)
 
2
(Si
 
5
O
 
13
) · 4H
 
2
O
9.AK.30Coutinhoite
Th
 
x
Ba
 
(1-2x)
(UO
 
2
)
 
2
Si
 
5
O
 
13
· (H
 
2
O)
 
1+y
(0 < x < 0.5 and 0 < y < (2+x))
9.AK.35Magnioursilite
Mg
 
4
(UO
 
2
)
 
4
(Si
 
2
O
 
5
)
 
5
(OH)
 
6
· 20H
 
2
O
9.AK.35Calcioursilite
Ca
 
4
(UO
 
2
)
 
4
(Si
 
2
O
 
5
)
 
5
(OH)
 
6
· 15H
 
2
O
9.AK.40Uranosilite
UO
 
3
· 7SiO
 
2

Other Names for Ursilite

Synonyms:
Mg-Ursilite
Other Languages:
German:Mg-Ursilit
Ursilit
Spanish:Ursilita
Varieties:
Calcium-ursiliteMagnioursilite

Other Information

Health Warning: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:

- +
Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva (1977): 106: 553-564.

Internet Links for Ursilite

Search Engines:
  • Look for Ursilite on Google
  • Look for Ursilite images on Google
  • External Links:
  • Look for Ursilite on Webmineral
  • Look for Ursilite on Athena Mineralogy
  • Look for Ursilite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Mineral Dealers:
  • Fine Minerals from Weinrich Minerals, Inc.
  • Buy minerals from YourMineralCollection
  • DAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.
  • Fabre Minerals - search for Ursilite specimens
  • Top quality minerals from Kristalle of California
  • Search for Ursilite on Well-Arranged Molecules
  • Lapis Mineral Magazin
  • Buy from McDougall Minerals
  • The Arkenstone - Fine Minerals
  • Fine and rare minerals from mintreasure.com
  • Buy from David K Joyce minerals
  • High-end worldwide specimens & outstanding customer service
  • Localities for Ursilite

    The 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. ? 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
    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  
    Search Google  
    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
    Current server date and time: November 26, 2014 11:13:31
    Mineral and Locality Search
    Mineral:
    and/or Locality:
    Options
    Fade toolbar when not in focusFix toolbar to bottom of page
    Hide Social Media Links
    Slideshow frame delay seconds