Běhounekite
A valid IMA mineral species
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About Běhounekite
František Běhounek
Formula:
U(SO4)2(H2O)4
Colour:
Green
Lustre:
Vitreous
Hardness:
2
Specific Gravity:
3.62 (Calculated)
Crystal System:
Orthorhombic
Name:
Named in honour of Prof. František Běhounek (27 October 1898, Prague, Austria-Hungary – 1 January 1973, Karlovy Vary, Czechoslovakia), nuclear physicist, explorer, and writer. The asteroid 3278 Běhounek is also named after him.
Unique Identifiers
Mindat ID:
41073
Long-form identifier:
mindat:1:1:41073:5
GUID
(UUID V4):
(UUID V4):
2479e35c-775e-4d9d-9b7a-6c568cfcc556
IMA Classification of Běhounekite
Approved
IMA Formula:
U(SO4)2(H2O)4
Approval year:
2010
First published:
2011
Type description reference:
Plášil, J., Fejfarová, K., Novák, M., Dušek, M., Škoda, R., Hloušek, J., Čejka, J., Majzlan, J., Sejkora, J., Machovic, V., Talla, D. (2011) Bêhounekite, U(SO4)2(H2O)4, from Jáchymov (St Joachimsthal), Czech Republic: the first natural U4+ sulphate. Mineralogical Magazine, 75 (6) 2739-2753 doi:10.1180/minmag.2011.075.6.2739
Classification of Běhounekite
7.E0.
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
E : Uranyl sulfates
0 :
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
E : Uranyl sulfates
0 :
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 |
|---|---|---|
| Bhn | 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 Běhounekite
Vitreous
Transparency:
Transparent, Translucent
Colour:
Green
Streak:
Grey, greenish grey
Hardness:
2 on Mohs scale
Tenacity:
Brittle
Cleavage:
Very Good
Very good along {100}
Very good along {100}
Fracture:
Irregular/Uneven
Density:
3.62 g/cm3 (Calculated)
Optical Data of Běhounekite
Type:
Biaxial (+)
RI values:
nα = 1.590(2) nβ = 1.618(4) nγ = 1.659(2)
2V:
Calculated: 81°
Birefringence:
0.069
Max Birefringence:
δ = 0.069
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
Pleochroism:
Visible
Comments:
α ~ β = pale emerald green; γ = emerald green
Chemistry of Běhounekite
Mindat Formula:
U(SO4)2(H2O)4
Elements listed:
Crystallography of Běhounekite
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnma
Cell Parameters:
a = 14.6464(3) Å, b = 11.0786(3) Å, c = 5.6910(1) Å
Ratio:
a:b:c = 1.322 : 1 : 0.514
Unit Cell V:
923.43 ų
Z:
4
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.330 Å | (100) |
| 6.112 Å | (54) |
| 5.538 Å | (21) |
| 4.787 Å | (42) |
| 3.663 Å | (17) |
| 3.478 Å | (20) |
| 3.080 Å | (41) |
| 2.495 Å | (17) |
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 Běhounekite
General Appearance of Type Material:
Short prismatic to tabular crystals, less commonly long prismatic crystals up to 0.5 mm long.
Place of Conservation of Type Material:
National Museum in Prague, Czech Republic, catalogue number P1p 2/2010.
Geological Setting of Type Material:
Běhounekite is a very rare secondary mineral that was found on material collected from the footwall of the mine adit. It occurs on highly altered arsenic.
Reference:
Plášil, J., Fejfarová, K., Novák, M., Dušek, M., Škoda, R., Hloušek, J., Čejka, J., Majzlan, J., Sejkora, J., Machovič, V. & Talla, D. (2011) Běhounekite, U(SO4)2(H2O)4 , from Jáchymov (St Joachimsthal), Czech Republic: the first natural U4+ sulphate. Mineralogical Magazine: 75: 2739-2753.
Synonyms of Běhounekite
Common Associates
Related Minerals - Strunz-mindat Grouping
| 7.E0. | Belakovskiite | Na7(UO2)(SO4)4(SO3OH)(H2O)3 |
Other Information
Magnetism:
Non-Magnetic
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 Běhounekite
mindat.org URL:
https://www.mindat.org/min-41073.html
Please feel free to link to this page.
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External Links:
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References for Běhounekite
Reference List:
Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2011) New minerals and nomenclature modifications approved in 2010, CNMNC Newsletter No 7. Mineralogical Magazine, 75 (1) 27-31 doi:10.1180/minmag.2011.075.1.27
Plášil, J., Fejfarová, K., Novák, M., Dušek, M., Škoda, R., Hloušek, J., Čejka, J., Majzlan, J., Sejkora, J., Machovic, V., Talla, D. (2011) Bêhounekite, U(SO4)2(H2O)4, from Jáchymov (St Joachimsthal), Czech Republic: the first natural U4+ sulphate. Mineralogical Magazine, 75 (6) 2739-2753 doi:10.1180/minmag.2011.075.6.2739
Localities for Běhounekite
symbol to view information about a locality.
The 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).
All localities listed without proper references should be considered as questionable.
Czech Republic (TL) | |
| Plášil et al. (2011) +1 other reference |
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Geschieber vein, Svornost Mine, Jáchymov, Karlovy Vary District, Karlovy Vary Region, Czech Republic