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Beshtauite

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Formula:
(NH4)2(UO2)(SO4)2•2H2O
Colour:
Light green
Lustre:
Vitreous
Hardness:
2
Specific Gravity:
3.046 (Calculated)
Crystal System:
Monoclinic
Name:
Named after the locality
New structure type. Beshtauite is important indicator mineral: its presence can be considered as an evidence of transportation of U6+ in nature in forms of mobile complexes of uranyl cation with ammonia or polyamines.


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Classification of BeshtauiteHide

Approved
Approval Year:
2012

Physical Properties of BeshtauiteHide

Vitreous
Transparency:
Transparent
Colour:
Light green
Hardness:
Comment:
ca. 2
Tenacity:
Brittle
Cleavage:
None Observed
Density:
3.046 g/cm3 (Calculated)

Optical Data of BeshtauiteHide

Type:
Biaxial (+)
RI values:
nα = 1.566(3) nβ = 1.566(3) nγ = 1.592(3)
2V:
Measured: < 10°
Max Birefringence:
δ = 0.026
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low

Chemical Properties of BeshtauiteHide

Formula:
(NH4)2(UO2)(SO4)2•2H2O
IMA Formula:
(NH4)2(UO2)(SO4)2 · 2H2O

Crystallography of BeshtauiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 7.7360(8) Å, b = 7.3712(5) Å, c = 20.856(2) Å
β = 102.123(8)°
Ratio:
a:b:c = 1.049 : 1 : 2.829
Unit Cell V:
1162.76 ų
Z:
4
Morphology:
Short-prismatic
Comment:
From single-crystal X-ray diffraction data

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
6.86(100)
5.997(19)
5.558(15)
5.307(36)
5.005(35)
3.410(38)
3.081(24)
2.881(20)
Comments:
From Type Description.

Type Occurrence of BeshtauiteHide

General Appearance of Type Material:
well-shaped short-prismatic crystals up to 0.1 × 0.15 × 0.2 mm, their clusters and crusts up to 0.5 mm across growing on marcasite.
Place of Conservation of Type Material:
Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia, registration number 4280/1
Geological Setting of Type Material:
Oxidation zone of the Beshtau uranium deposit,Northern Caucasus, Russia.
Associated Minerals at Type Locality:

Synonyms of BeshtauiteHide

Fluorescence of BeshtauiteHide

Fluoresces strongly yellow-green under both short- and long-wave UV irradiation

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 BeshtauiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Pekov, I.V., Krivovichev, S.V., Yapaskurt, V.O., Chukanov, N.V. and Belakovskiy, D.I. (2013) Beshtauite, IMA 2012-051. February 2013, page 3; Mineralogical Magazine, 77, 1-12.
Pekov, I.V., Krivovichev, S.V., Yapaskurt, V.O., Chukanov, N.V., Belakovskiy, D.I. (2014): Beshtauite, (NH4)2(UO2)(SO4)2·2H2O, a new mineral from Mount Beshtau, Northern Caucasus, Russia. American Mineralogist, 99, 1783-1787

Internet Links for BeshtauiteHide

Localities for BeshtauiteHide

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.
Russia (TL)
 
  • Northern Caucasus Region
    • Stavropol'skiy Kray
      • Pyatigorsk
        • Lermontovskoe U Deposit
          • Beshtau Mt.
            • mine №1
Pekov, I.V., Krivovichev, S.V., Yapaskurt, V.O., Chukanov, N.V. and Belakovskiy, D.I. (2013) Beshtauite, IMA 2012-051. February 2013, page 3; Mineralogical Magazine, 77, 1-12; Pekov, I.V., Krivovichev, S.V., Yapaskurt, V.O., Chukanov, N.V., Belakovskiy, D.I. (2014): Beshtauite, (NH4)2(UO2)(SO4)2·2H2O, a new mineral from Mount Beshtau, Northern Caucasus, Russia. American Mineralogist, 99, 1783-1787
USA
 
  • Utah
    • San Juan Co.
      • White Canyon District
        • Red Canyon
Kampf, A.R., Plášil, J., Kasatkin, A.V., Marty, J., Čejka, J. and Lapčák, L. (2015) Shumwayite, IMA 2015-058. CNMNC Newsletter No. 27, October 2015, page 1228; Mineralogical Magazine, 79, 1229–1236.
Mineral and/or Locality  
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