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Geschieberite

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About GeschieberiteHide

Formula:
K2(UO2)(SO4)2·2H2O
Colour:
Bright green
Hardness:
2
Specific Gravity:
3.259 (Calculated)
Crystal System:
Orthorhombic
Name:
The mineral is named for one of the most important ore veins in Jáchymov – the Geschieber vein.
Known synthetic analogue. A secondary alteration phase after uraninite.


Classification of GeschieberiteHide

Approved
Approval Year:
2014
First Published:
2015

Physical Properties of GeschieberiteHide

Transparency:
Transparent, Translucent
Colour:
Bright green
Streak:
Greenish-white
Hardness:
Comment:
~2
Tenacity:
Brittle
Cleavage:
Perfect
on {100}
Fracture:
Irregular/Uneven
Density:
3.259 g/cm3 (Calculated)

Optical Data of GeschieberiteHide

Type:
Biaxial (-)

Chemical Properties of GeschieberiteHide

Formula:
K2(UO2)(SO4)2·2H2O
IMA Formula:
K2(UO2)(SO4)2 · 2H2O

Crystallography of GeschieberiteHide

Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Pna21
Setting:
Pna21
Cell Parameters:
a = 13.7778(3) Å, b = 7.2709(4) Å, c = 11.5488(2) Å
Ratio:
a:b:c = 1.895 : 1 : 1.588
Unit Cell V:
1156.92 ų
Z:
4
Morphology:
Aggregates composed of multiply intergrown prismatic crystals elongated on [001]. Forms observed are {010} and {001}.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
6.882(100)
5.622(53)
4.589(12)
4.428(16)
3.681(18)
3.304(15)
3.079(14)
3.006(17)
Comments:
From Type Description.

Type Occurrence of GeschieberiteHide

General Appearance of Type Material:
Crystalline aggregates of bright green colour
Place of Conservation of Type Material:
Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow, Russia, registration number 4537/1.
Associated Minerals at Type Locality:

Synonyms of GeschieberiteHide

Fluorescence of GeschieberiteHide

Strong yellowish-green fluorescence under both shortwave and longwave UV

Other InformationHide

Notes:
Slightly soluble in cold H2O
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 GeschieberiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Niinistö, L., Toivonen, J., Valkonen, J. (1979) Uranyl(VI) compounds. II. The crystal structure of postassium uranyl sulfate dihydrate, K2UO2(SO4)2·2H2O. Acta Chemica Scandinavica: A33: 621-624.
Alekseev, E.V., Suleĭmanov, E.V., Chuprunov, E.V., Marychev, M.O., Ivanov, V.A., Fukin, G.K. (2006) Crystal structure and nonlinear optical: 51: 29-33.
Plášil, J., Hloušek, J., Kasatkin, A.V., Škoda, R., Novák, M., Cejka, J. (2014) Geschieberite, IMA 2014-006. CNMNC Newsletter No. 20, June 2014, page 555; Mineralogical Magazine: 78: 549-558.
Plášil, J., Hloušek, J., Kasatkin, A.V., Škoda, R., Novák, M., Cejka, J. (2015) Geschieberite, K2(UO2)(SO4)2(H2O)2, a new uranyl sulfate mineral from Jáchymov. Mineralogical Magazine: 79: 205-216.
Belakovskiy, D.I., Gagne, O.C., Uvarova, Y. (2016) New mineral names. American Mineralogist: 101: 2570-2573.

Internet Links for GeschieberiteHide

Localities for GeschieberiteHide

ⓘ - 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)
Plášil, J., Hloušek, J., Kasatkin, A.V., Škoda, R., Novák, M., Cejka, J. (2014) Geschieberite, IMA 2014-006. CNMNC Newsletter No. 20, June 2014, page 555; Mineralogical Magazine, 78, 549-558; Plášil, J., Hloušek, J., Kasatkin, A.V., Škoda, R., Novák, M., Cejka, J. (2015): Geschieberite, K2(UO2)(SO4)2(H2O)2, a new uranyl sulfate mineral from Jáchymov. Mineralogical Magazine. 79, 205-216
Mineral and/or Locality  
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