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Oursinite

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Formula:
Co(UO2)2(SiO3OH)2 · 6H2O
All material so far seems to contain minor Mg replacing Co.
Colour:
Pale yellow
Hardness:
3 - 3½
Specific Gravity:
3.674 (Calculated)
Crystal System:
Orthorhombic
Name:
From the french oursin, in allusion to its appearance like a sea urchin
This page provides mineralogical data about Oursinite.


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Classification of OursiniteHide

Approved
Approval Year:
1982
9.AK.10

9 : SILICATES (Germanates)
A : Nesosilicates
K : Uranyl neso- and polysilicates
53.3.1.7

53 : NESOSILICATES Insular SiO4 Groups and Other Anions or Complex Cations
3 : Insular SiO4 Groups and Other Anions of Complex Cations with (UO2)
14.16.19

14 : Silicates not Containing Aluminum
16 : Silicates of U

Physical Properties of OursiniteHide

Transparency:
Transparent
Colour:
Pale yellow
Hardness:
3 - 3½ on Mohs scale
Cleavage:
Distinct/Good
on {hk0}
Density:
3.674 g/cm3 (Calculated)

Optical Data of OursiniteHide

Type:
Biaxial (-)
RI values:
nα = 1.624 nβ = 1.640 nγ = 1.650
2V:
Measured: 76° , Calculated: 76°
Max Birefringence:
δ = 0.026
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
weak

Chemical Properties of OursiniteHide

Formula:
Co(UO2)2(SiO3OH)2 · 6H2O

All material so far seems to contain minor Mg replacing Co.
Common Impurities:
Ni

Crystallography of OursiniteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Cmca
Cell Parameters:
a = 7.0494 Å, b = 17.55 Å, c = 12.734 Å
Ratio:
a:b:c = 0.402 : 1 : 0.726
Unit Cell V:
1575.4 ų
Z:
4
Morphology:
Radiating aggregates of acicular crystals to 1mm.

Type Occurrence of OursiniteHide

Synonyms of OursiniteHide

Other Language Names for OursiniteHide

German:Oursinit
Spanish:Oursinita

Relationship of Oursinite to other SpeciesHide

Other Members of this group:
CuprosklodowskiteCu(UO2)2(SiO3OH]2 · 6H2OTric. 1 : P1
SklodowskiteMg(UO2)2(SiO3OH)2 · 6H2OMon. 2/m : B2/m

Common AssociatesHide

Associated Minerals Based on Photo Data:
Becquerelite1 photo of Oursinite associated with Becquerelite on mindat.org.
Heterogenite1 photo of Oursinite associated with Heterogenite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.AK.05Soddyite(UO2)2SiO4 · 2H2OOrth.
9.AK.10CuprosklodowskiteCu(UO2)2(SiO3OH]2 · 6H2OTric. 1 : P1
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) · H2O
9.AK.15Uranophane-βCa(UO2)2(SiO3OH)2 · 5H2OMon.
9.AK.15UranophaneCa(UO2)2(SiO3OH)2 · 5H2OMon. 2 : P21
9.AK.15Beta-UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
9.AK.20Swamboite-(Nd)Nd0.333[(UO2)(SiO3OH)](H2O)∼2.5Mon.
9.AK.25HaiweeiteCa(UO2)2[Si5O12(OH)2] · 6H2OMon.
9.AK.25MetahaiweeiteCa(UO2)2Si6O15 · nH2O
9.AK.25RanquiliteCa(UO2)2[Si5O12(OH)2] · 6H2O
9.AK.30WeeksiteK2(UO2)2(Si5O13) · 4H2OOrth.
9.AK.30CoutinhoiteThxBa(1-2x)(UO2)2Si5O13 · (H2O)1+y (0 < x < 0.5 and 0 < y < (2+x))Orth.
9.AK.35UrsiliteMg4(UO2)4(Si2O5)5.5(OH)5 · 13H2OOrth.
9.AK.35MagnioursiliteMg4(UO2)4(Si2O5)5(OH)6 · 20H2O
9.AK.35CalcioursiliteCa4(UO2)4(Si2O5)5(OH)6 · 15H2O
9.AK.40UranosiliteUO3 · 7SiO2Orth.

Related Minerals - Dana Grouping (8th Ed.)Hide

53.3.1.1KasolitePb(UO2)[SiO4] · H2OMon. 2/m : P21/b
53.3.1.2UranophaneCa(UO2)2(SiO3OH)2 · 5H2OMon. 2 : P21
53.3.1.3SklodowskiteMg(UO2)2(SiO3OH)2 · 6H2OMon. 2/m : B2/m
53.3.1.4CuprosklodowskiteCu(UO2)2(SiO3OH]2 · 6H2OTric. 1 : P1
53.3.1.5Boltwoodite(K,Na)(UO2)(SiO3OH) · 1.5H2OMon. 2 : P21
53.3.1.6NatroboltwooditeNa(UO2)(SiO3OH) · H2O
53.3.1.8Swamboite-(Nd)Nd0.333[(UO2)(SiO3OH)](H2O)∼2.5Mon.
53.3.1.9Uranophane-βCa(UO2)2(SiO3OH)2 · 5H2OMon.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.16.1UranosiliteUO3 · 7SiO2Orth.
14.16.2Coffinite(U4+,Th)(SiO4)1-x(OH)4xTet.
14.16.3Soddyite(UO2)2SiO4 · 2H2OOrth.
14.16.4Swamboite-(Nd)Nd0.333[(UO2)(SiO3OH)](H2O)∼2.5Mon.
14.16.5WeeksiteK2(UO2)2(Si5O13) · 4H2OOrth.
14.16.6Boltwoodite(K,Na)(UO2)(SiO3OH) · 1.5H2OMon. 2 : P21
14.16.7NatroboltwooditeNa(UO2)(SiO3OH) · H2O
14.16.8CuprosklodowskiteCu(UO2)2(SiO3OH]2 · 6H2OTric. 1 : P1
14.16.9SklodowskiteMg(UO2)2(SiO3OH)2 · 6H2OMon. 2/m : B2/m
14.16.10UranophaneCa(UO2)2(SiO3OH)2 · 5H2OMon. 2 : P21
14.16.11Uranophane-βCa(UO2)2(SiO3OH)2 · 5H2OMon.
14.16.12HaiweeiteCa(UO2)2[Si5O12(OH)2] · 6H2OMon.
14.16.13MetahaiweeiteCa(UO2)2Si6O15 · nH2O
14.16.15SteacyiteK0.3(Na,Ca)2ThSi8O20Tet. 4/mmm (4/m 2/m 2/m) : P4/mcc
14.16.16EkaniteCa2ThSi8O20Tet. 4 2 2 : I4 2 2
14.16.17KasolitePb(UO2)[SiO4] · H2OMon. 2/m : P21/b
14.16.18OrlitePb3(UO2)3(Si2O7)2 · 6H2O

Other InformationHide

Health Risks:
Radioactive

References for OursiniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Deliens, M., Piret, P. (1983) L'oursinite (Co0.86Mg0.10Ni0.04)0.2UO3·2SiO2·6H2O, nouveau mineral de Shinkolobwe, Shaba, Zaïre. Bulletin de la Société française de Minéralogie et de Cristallographie: 106: 305-308.
American Mineralogist (1984): 69: 567.
Burns, P.C. (2005) U6+ minerals and inorganic compounds: insights into an expanded structural hierarchy of crystal structures. Canadian Mineralogist: 43: 1839-1894.
Kobatko, K.-A., Burns, P.C. (2006) A novel arrangement of silicate tetrahedra in the uranyl sheet of oursinite, (Co0.8Mg0.2)[(UO2)(SiO3OH)]2(H2O)6. American Mineralogist: 91: 333-336.

Internet Links for OursiniteHide

Localities for OursiniteHide

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.
Democratic Republic of Congo (Zaïre) (TL)
 
  • Katanga (Shaba)
    • Katanga Copper Crescent
      • Shinkolobwe
Bull.Minéral.(1983) 106, 305-308
Mineral and/or Locality  
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