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Svornostite

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Formula:
K2Mg[(UO2)(SO4)2]2·8H2O
Colour:
Light yellow
Lustre:
Vitreous
Hardness:
2
Specific Gravity:
3.268 (Calculated)
Crystal System:
Orthorhombic
Name:
Name after the type locality, the Svornost mine.
A low-temperature, supergene mineral formed by the post-mining weathering of uraninite.


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Classification of SvornostiteHide

Approved
Approval Year:
2014
First Published:
2015

Physical Properties of SvornostiteHide

Vitreous
Transparency:
Transparent, Translucent
Comment:
Strong vitreous lustre
Colour:
Light yellow
Streak:
Pale yellow
Hardness:
Comment:
~2
Tenacity:
Brittle
Cleavage:
Perfect
on {100} and {010}.
Fracture:
Irregular/Uneven
Density:
3.268 g/cm3 (Calculated)

Optical Data of SvornostiteHide

Type:
Biaxial (+)
RI values:
nα = 1.548(2) nγ = 1.585(2)
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2V:
Calculated: 56°
Birefringence:
0.037
Max Birefringence:
δ = 0.037
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
None observed
Pleochroism:
Non-pleochroic
Comments:
None observed
Comments:
The optical orientation is Z = c

Chemical Properties of SvornostiteHide

Formula:
K2Mg[(UO2)(SO4)2]2·8H2O
IMA Formula:
K2Mg[(UO2)(SO4)2]2 · 8H2O

Crystallography of SvornostiteHide

Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Pmn21
Cell Parameters:
a = 12.7850(3) Å, b = 8.2683(4) Å, c = 11.2163(3) Å
Ratio:
a:b:c = 1.546 : 1 : 1.357
Unit Cell V:
1185.68 ų
Z:
2
Morphology:
Crystals are long prisms elongated on [001] and flattened on {100}. Crystals exhibit the forms {100}, {010} and {011}, usually forming multiple intergrowths. crusts

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
8.279(50)
6.398(100)
5.060(55)
4.645(40)
4.610(38)
3.881(34)
3.318(44)
3.009(44)
Comments:
From Type Description.

Type Occurrence of SvornostiteHide

General Appearance of Type Material:
Crystalline crusts consisting of yellow prismatic crystals.
Place of Conservation of Type Material:
Type material is deposited in the collections of the Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia, registration number 4537/1
Associated Minerals at Type Locality:

Synonyms of SvornostiteHide

Fluorescence of SvornostiteHide

Strong yellowish-green fluorescence under both long-wave and short-wave UV

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 SvornostiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Plašil, J., Kasatkin, A.V., Hloušek, J., Novák, M., Čejka, J., Lapčák, L. (2015) Svornostite, IMA 2014-078. CNMNC Newsletter No. 23, February 2015, page 56; Mineralogical Magazine: 79: 51-58.
Plášil, J., Hloušek, J., Kasatkin, A.V., Novak, M., Čejka, J., Lapčák, L. (2015) Svornostite, K2Mg[(UO2)(SO4)2]2∙8H2O, a new uranyl sulfate mineral from Jáchymov, Czech Republic. Journal of Geosciences: 60: 113-121.

Internet Links for SvornostiteHide

Localities for SvornostiteHide

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)
Plašil, J., Kasatkin, A.V., Hloušek, J., Novák, M., Čejka, J. and Lapčák, L. (2015) Svornostite, IMA 2014-078. CNMNC Newsletter No. 23, February 2015, page 56; Mineralogical Magazine, 79, 51-58; Plášil, J., Hloušek, J., Kasatkin, A.V., Novak, M., Čejka, J., Lapčák, L. (2015): Svornostite, K2Mg[(UO2)(SO4)2]2∙8H2O, a new uranyl sulfate mineral from Jáchymov, Czech Republic. Journal of Geosciences. 60,113-121.
Mineral and/or Locality  
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