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Ca(UO2)2(SiO3OH)2 · 5H2O
Light yellow, lemon-yellow, honey-yellow, straw-yellow, green-yellow
Vitreous, Greasy, Silky, Dull, Earthy
2 - 3
Specific Gravity:
3.8 - 3.91
Crystal System:
Named in 1853 by Christian Friedrich Martin Websky for the chemical composition containing URANium plus Greek φαινερθαι "phainesthai", to appear, in allusion to the uncertainty of its composition as originally determined.
Dimorph of:
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Classification of UranophaneHide

Approved, 'Grandfathered' (first described prior to 1959)

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

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

14 : Silicates not Containing Aluminum
16 : Silicates of U

Pronounciation of UranophaneHide

PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of UranophaneHide

Vitreous, Greasy, Silky, Dull, Earthy
Transparent, Translucent
Pearly on cleavage, waxy or dull when massive
Light yellow, lemon-yellow, honey-yellow, straw-yellow, green-yellow
2 - 3 on Mohs scale
on {100}
3.8 - 3.91 g/cm3 (Measured)    3.78 g/cm3 (Calculated)

Optical Data of UranophaneHide

Biaxial (-)
RI values:
nα = 1.643 nβ = 1.666 nγ = 1.669
Measured: 32° to 45°, Calculated: 38°
Max Birefringence:
δ = 0.026
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
r < v strong
X= colorless
Y= pale canary yellow
Z= canary yellow

Chemical Properties of UranophaneHide

Ca(UO2)2(SiO3OH)2 · 5H2O

Crystallography of UranophaneHide

Crystal System:
Class (H-M):
2 - Sphenoidal
Space Group:
Cell Parameters:
a = 15.85 Å, b = 6.98 Å, c = 6.64 Å
β = 97.45°
a:b:c = 2.271 : 1 : 0.951
Unit Cell V:
728.40 ų (Calculated from Unit Cell)
Composite needles, stellate aggregates, fibrous or felted crusts, massive.

Type Occurrence of UranophaneHide

Synonyms of UranophaneHide

Other Language Names for UranophaneHide

Simplified Chinese:硅钙铀矿
Traditional Chinese:矽鈣鈾礦

Relationship of Uranophane to other SpeciesHide

Other Members of this group:
Boltwoodite(K,Na)(UO2)(SiO3OH) · 1.5H2OMon. 2 : P21
NatroboltwooditeNa(UO2)(SiO3OH) · H2O
Uranophane-βCa(UO2)2(SiO3OH)2 · 5H2OMon.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Uraninite102 photos of Uranophane associated with Uraninite on
Meta-autunite36 photos of Uranophane associated with Meta-autunite on
Gummite21 photos of Uranophane associated with Gummite on
Autunite21 photos of Uranophane associated with Autunite on
Becquerelite19 photos of Uranophane associated with Becquerelite on
Fourmarierite17 photos of Uranophane associated with Fourmarierite on
Wölsendorfite16 photos of Uranophane associated with Wölsendorfite on
Zircon15 photos of Uranophane associated with Zircon on
Rutherfordine15 photos of Uranophane associated with Rutherfordine on
Vandendriesscheite14 photos of Uranophane associated with Vandendriesscheite on

Related Minerals - Nickel-Strunz GroupingHide

9.AK.05Soddyite(UO2)2SiO4 · 2H2OOrth.
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) · H2O
9.AK.15Uranophane-βCa(UO2)2(SiO3OH)2 · 5H2OMon.
9.AK.15Beta-UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
9.AK.25HaiweeiteCa(UO2)2[Si5O12(OH)2] · 6H2OMon.
9.AK.25MetahaiweeiteCa(UO2)2Si6O15 · nH2O
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[SiO4] · H2OMon. 2/m : P21/b · 6H2OMon. 2/m : B2/m]2 · 6H2OTric. 1 : P1,Na)(UO2)(SiO3OH) · 1.5H2OMon. 2 : P21 · H2O · 6H2OOrth. mmm (2/m 2/m 2/m) : Cmca[(UO2)(SiO3OH)](H2O)∼2.5Mon.βCa(UO2)2(SiO3OH)2 · 5H2OMon.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.16.1UranosiliteUO3 · 7SiO2Orth.
14.16.3Soddyite(UO2)2SiO4 · 2H2OOrth.
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
14.16.11Uranophane-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
14.16.19OursiniteCo(UO2)2(SiO3OH)2 · 6H2OOrth. mmm (2/m 2/m 2/m) : Cmca

Fluorescence of UranophaneHide

Weakly green, usually not fluorescent when massive

Other InformationHide

Health Risks:
Contains uranium - always wash hands after handling. Avoid inhaling dust when handling or breaking. Never lick or ingest. Avoid prolonged exposure in proximity of the body. Store away from inhabited areas.

References for UranophaneHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Zeits. deutsche Geol.Ges. (1853), 5, 427.
American Mineralogist (1939): 24: 324-328.
Stohl, F. V. & Smith, D. K. (1981): The crystal chemistry of the uranyl silicate minerals. American Mineralogist 66, 615-625.
Ginderow, D. (1988) Structure de l'uranophane alpha, Ca(UO2)2(SiO3OH)2.5H2O. Acta Crystallographica: C44: 421-424.
American Mineralogist (1986): 71: 1489-1493.
Burns, P.C. (2005) U 6+ minerals and inorganic compounds: insights into an expanded structural hierarchy of crystal structures. Canadian Mineralogist: 43: 1839-1894.

Internet Links for UranophaneHide

Localities for UranophaneHide

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 ListShow

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