Uranopilite
A valid IMA mineral species - grandfathered
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About Uranopilite
Formula:
(UO2)6(SO4)O2(OH)6 · 14H2O
Water content appears to be variable (12-14H2O).
Colour:
Bright yellow, straw-yellow; colourless to light yellow in transmitted light.
Lustre:
Silky, Earthy
Specific Gravity:
3.7 - 4.0
Crystal System:
Triclinic
Name:
The name reflects its composition and habit, containing URANium plus Greek πίλος = "PILos" "felt", alluding to its felt-like appearance.
Unique Identifiers
Mindat ID:
4108
Long-form identifier:
mindat:1:1:4108:5
GUID
(UUID V4):
(UUID V4):
de94cab5-1dfc-48f8-896c-ab7576483a1e
Classification of Uranopilite
Approved, 'Grandfathered' (first described prior to 1959)
Type description reference:
7.EA.05
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
E : Uranyl sulfates
A : Without cations
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
E : Uranyl sulfates
A : Without cations
31.2.6.1
31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
2 : (AB)6(XO4)Zq·xH2O
31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
2 : (AB)6(XO4)Zq·xH2O
25.8.9
25 : Sulphates
8 : Sulphates of Sb, V, Cr and U
25 : Sulphates
8 : Sulphates of Sb, V, Cr and U
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Up | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Uranopilite
Silky, Earthy
Transparency:
Translucent
Colour:
Bright yellow, straw-yellow; colourless to light yellow in transmitted light.
Comment:
Soft
Cleavage:
Perfect
On {010}, perfect.
On {010}, perfect.
Density:
3.7 - 4.0 g/cm3 (Measured) 3.74 g/cm3 (Calculated)
Optical Data of Uranopilite
Type:
Biaxial (+)
RI values:
nα = 1.621 - 1.623 nβ = 1.623 - 1.625 nγ = 1.632 - 1.634
2V:
Measured: 50° , Calculated: 52°
Max Birefringence:
δ = 0.011
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v to r < v strong
Pleochroism:
Visible
Comments:
X = colorless; Y = Z = yellow.
Chemical Properties of Uranopilite
Formula:
(UO2)6(SO4)O2(OH)6 · 14H2O
Water content appears to be variable (12-14H2O).
Water content appears to be variable (12-14H2O).
Elements listed:
Crystallography of Uranopilite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 8.896(2) Å, b = 14.029(3) Å, c = 14.339(3) Å
α = 96.610(4)°, β = 98.472(4)°, γ = 99.802(4)°
α = 96.610(4)°, β = 98.472(4)°, γ = 99.802(4)°
Ratio:
a:b:c = 0.634 : 1 : 1.022
Unit Cell V:
1,726.03 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Occurs as velvety incrustations and globular or reniform masses comprised of microscopic needles or laths, elongated [001] and flattened {010}.
Comment:
Originally assumed to be monoclinic, a = 14.03(1) Å, b = 14.60(1) Å, c = 9.184(6) Å, β = 96.87(6)°.
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0005730 | Uranopilite | Burns P C (2001) A new uranyl sulfate chain in the structure of uranopilite The Canadian Mineralogist 39 1139-1146 | 2001 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
9.18 Å | (80) |
7.12 Å | (100) |
5.51 Å | (40) |
4.28 Å | (80) |
3.65 Å | (50) |
3.31 Å | (40) |
2.99 Å | (30) |
Comments:
Wheal Owles, England.
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 7: Great Oxidation Event | <2.4 |
47a : [Near-surface hydration of prior minerals] | |
47b : [Sulfates and sulfites] | |
47f : [Uranyl (U⁶⁺) minerals] | |
Stage 10b: Anthropogenic minerals | <10 Ka |
55 : Anthropogenic mine minerals |
Type Occurrence of Uranopilite
Co-Type Localities:
Place of Conservation of Type Material:
Technische Universität, Bergakademie, Freiberg, Germany, numbers 18738, 18742, 18743 (type)
Universität Göttingen, Göttingen, Germany, number GZG.MIN.6.4.98.3. (type).
Universität Göttingen, Göttingen, Germany, number GZG.MIN.6.4.98.3. (type).
Associated Minerals at Type Locality:
Reference:
Weisbach A. (1882) Mineralogische Notizen II. 17. Uranocher, Neues Jahrbuch für Mineralogie, Bd. 2, 258-259.
Synonyms of Uranopilite
Other Language Names for Uranopilite
Common Associates
Associated Minerals Based on Photo Data:
11 photos of Uranopilite associated with Zippeite | K3(UO2)4(SO4)2O3(OH) · 3H2O |
9 photos of Uranopilite associated with Gypsum | CaSO4 · 2H2O |
8 photos of Uranopilite associated with Uraninite | UO2 |
5 photos of Uranopilite associated with Zippeite Group | |
4 photos of Uranopilite associated with Rutherfordine | (UO2)CO3 |
4 photos of Uranopilite associated with Metalodèvite | Zn(UO2)2(AsO4)2 · 10H2O |
4 photos of Uranopilite associated with Albite | Na(AlSi3O8) |
4 photos of Uranopilite associated with Phosphuranylite | KCa(H3O)3(UO2)7(PO4)4O4 · 8H2O |
2 photos of Uranopilite associated with Parauranophane | Ca(UO2)2(SiO3OH)2 · 5H2O |
2 photos of Uranopilite associated with Johannite | Cu(UO2)2(SO4)2(OH)2 · 8H2O |
Related Minerals - Strunz-mindat Grouping
7.EA. | Scenicite | [(UO2)(H2O)2(SO4)]2 · 3H2O | Orth. mm2 : Pca21 |
7.EA.05 | Metauranopilite | (UO2)6(SO4)(OH)10 · 5H2O | |
7.EA.10 | Jáchymovite | (UO2)8(SO4)(OH)14 · 13H2O | Mon. 2/m : P21/m |
7.EA.15 | Shumwayite | (UO2)2(SO4)2 · 5H2O | Mon. 2/m : P21/b |
Fluorescence of Uranopilite
Bright yellowish-green (UV).
Other Information
Notes:
Radioactive
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Uranopilite
mindat.org URL:
https://www.mindat.org/min-4108.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Uranopilite
Reference List:
Localities for Uranopilite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
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Novotníky, Prádlo, Plzeň-South District, Plzeň Region, Czech Republic