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Ursilite

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About UrsiliteHide

Formula:
Mg4(UO2)4(Si2O5)5.5(OH)5 · 13H2O
Lustre:
Vitreous, Silky
Hardness:
2 - 3
Specific Gravity:
3.25 (Calculated)
Crystal System:
Orthorhombic
Name:
The name reflects the URANium and SILicon content
"Ursilite" is now said to be an obsolete name. The correct minerals names are calcioursilite and magnioursilite.
Historically, calcioursilite and magnioursilite were described together in 1957 as “ursilite” from the Oktyabr’skoye deposit, Kyzyltyube-Saj, Samgar Steppe, Tajikistan. The original publication considered two varieties: calcium ursilite ("almost pure Ca-U-silicate") and magnesium ursilite ("almost pure Mg-U-silicate").
The analyses showed Ca >Mg and Mg > Ca. Subsequently, calcioursilite and magnioursilite were defined instead of ursilite. Therefore today the name “ursilite” is nothing but an obsolete redundancy, and is officially discredited. It was descredited in 2018.


Classification of UrsiliteHide

Discredited
Approval History:
Pre-2018: Status grandfathered.
Descredited by IMA in april 2018, executive decision taken by the officers of the IMA CNMNC.
9..

9 : SILICATES (Germanates)
:
:

Physical Properties of UrsiliteHide

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

Optical Data of UrsiliteHide

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 UrsiliteHide

Formula:
Mg4(UO2)4(Si2O5)5.5(OH)5 · 13H2O
IMA Formula:
Mg4(UO2)2(Si2O5)5.5(OH)5 · 13H2O

Crystallography of UrsiliteHide

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)

First Recorded Occurrence of UrsiliteHide

Synonyms of UrsiliteHide

Other Language Names for UrsiliteHide

Varieties of UrsiliteHide

Related Minerals - Nickel-Strunz GroupingHide

9..Alumino-ferro-hornblende☐{Ca2}{Fe2+4Al}(AlSi7O22)(OH)2
9..Aluminobarroisite☐{CaNa}{Mg3Al2}(AlSi7O22)(OH)2Mon.
9..Alumino-magnesio-hornblende☐{Ca2}{Mg4Al}(AlSi7O22)(OH)2
9..Aluminokatophorite{Na}{CaNa}{Fe2+4Al}[(AlSi7)O22](OH)2Mon.
9..Aluminotschermakite☐{Ca2}{Mg3Al2}(Al2Si6O22)(OH)2Mon.
9..Alumino-ferrowinchite ☐{CaNa}{Fe2+4Al}(Si8O22)(OH)2
9..Alumino-ferrobarroisite☐{CaNa}{Fe2+3Al2}(AlSi7O22)(OH)2
9..Magnesiosadanagaite{Na}{Ca2}{Mg3Al2}(Al3Si5O22)(OH)2Mon. 2/m
9..ParaspurriteCa5(SiO4)2(CO3)Mon.
9..Uvite SeriesCa(Mg3)MgAl5(Si6O18)(BO3)3(OH)3(F/OH)Trig. 3m : R3m
9..HelviteMn2+4(Be3Si3O12)S
9..Fluorthalénite-(Y)Y3(Si3O10)FMon.
9..Manganocummingtonite☐{Mn2+2}{Mg5}(Si8O22)(OH)2Mon. 2/m : B2/m
9..RanquiliteCa(UO2)2[Si5O12(OH)2] · 6H2O
9..GismondineMon.
9..Ferriwhittakerite{Na}{Na1+xLi1-x}{Fe3+2Mg2Li}(Si8O22)(OH)2Mon. 2/m : B2/m
9..Ferri-ottoliniite◻{NaLi}{Mg3Fe3+2}(Si8O22)(OH)2Mon. 2/m : B2/m
9..IMA2007-015K[CaNa][Fe2+3Al2][(OH)2|Al2Si6O22]Mon. 2/m : B2/m
9..SodicpedriziteMon. 2/m : B2/m
9..Sodic-ferropedrizite
9..IMA2008-041Na7(Al6-xSi6+xO24)(C2O4)0.5+x · 5H2O (0 < x < 0.5)
9..IMA2009-059BaKNaTi2(Si4O12)O2Orth. mmm (2/m 2/m 2/m) : Imma
9..IMA2009-082Ba2(Ca,Mg)(V3+,Al)2(Si4O10)(OH,F)2O(CO3)2Mon. m : Bb
9..IMA2009-091{K}{Ca2}{Mg4Al}(Al2Si6O22)F2Mon. 2/m : B2/m

Other InformationHide

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 UrsiliteHide

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.
CNMNC Newsletter No 43, June 2018, page 785; Mineralogical Magazine, 82, 779-785.

Internet Links for UrsiliteHide

Localities for UrsiliteHide

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 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
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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