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Běhounekite

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About BěhounekiteHide

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.
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The only natural tetravalent uranium sulfate. One of a few U4+ natural salts, by the arsenate minerals štĕpite and vysokýite.


Classification of BěhounekiteHide

Approved
Approval Year:
2010
First Published:
2011

Physical Properties of BěhounekiteHide

Vitreous
Transparency:
Transparent, Translucent
Colour:
Green
Streak:
Grey, greenish grey
Hardness:
Tenacity:
Brittle
Cleavage:
Very Good
Very good along {100}
Fracture:
Irregular/Uneven
Density:
3.62 g/cm3 (Calculated)

Optical Data of BěhounekiteHide

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.
Surface Relief:
Moderate
Pleochroism:
Visible
Comments:
α ~ β = pale emerald green; γ = emerald green

Chemical Properties of BěhounekiteHide

Formula:
U(SO4)2(H2O)4
IMA Formula:
U(SO4)2(H2O)4

Crystallography of BěhounekiteHide

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 DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
7.330 (100)
6.112 (54)
5.538 (21)
4.787 (42)
3.663 (17)
3.478 (20)
3.080 (41)
2.495 (17)

Type Occurrence of BěhounekiteHide

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 BěhounekiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Arsenic3 photos of Běhounekite associated with Arsenic on mindat.org.

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 BěhounekiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Plášil, J., Fejfarová, K., Novák, M., Dušek, M., Sejkora, J., Škoda, R., Hloušek, J. and Majzlan, J. (2010) Běhounekite, IMA 2010-046. CNMNC Newsletter No. 7, February 2010, page 28; Mineralogical Magazine, 75, 27-31.
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.

Internet Links for BěhounekiteHide

Localities for BěhounekiteHide

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.
Czech Republic (TL)
 
  • Karlovy Vary Region
    • Krušné Hory Mts (Erzgebirge)
      • Jáchymov District (St Joachimsthal)
        • Jáchymov (St Joachimsthal)
          • Svornost Mine (Einigkeit Mine)
Plášil, J., Fejfarová, K., Novák, M., Dušek, M., Sejkora, J., Škoda, R., Hloušek, J. and Majzlan, J. (2010) Běhounekite, IMA 2010-046. CNMNC Newsletter No. 7, February 2010, page 28; Mineralogical Magazine, 75, 27-31.
Mineral and/or Locality  
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