Geschieberite
A valid IMA mineral species
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About Geschieberite
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.
Unique Identifiers
Mindat ID:
46101
Long-form identifier:
mindat:1:1:46101:2
GUID
(UUID V4):
(UUID V4):
f37fac94-6d67-40dc-9112-7eab9a9116be
IMA Classification of Geschieberite
Classification of Geschieberite
7.EC.55
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
E : Uranyl sulfates
C : With medium-sized and large cations
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
E : Uranyl sulfates
C : With medium-sized and large cations
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 |
---|---|---|
Gsb | 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 Geschieberite
Transparency:
Transparent, Translucent
Colour:
Bright green
Streak:
Greenish-white
Hardness:
2 on Mohs scale
Comment:
~2
Tenacity:
Brittle
Cleavage:
Perfect
on {100}
on {100}
Fracture:
Irregular/Uneven
Density:
3.259 g/cm3 (Calculated)
Optical Data of Geschieberite
Type:
Biaxial (-)
Optical Extinction:
X = a.
Chemistry of Geschieberite
Mindat Formula:
K2(UO2)(SO4)2 · 2H2O
Crystallography of Geschieberite
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}.
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0020637 | Geschieberite | Niinisto L, Toivonen J, Valkonen J (1979) Uranyl(VI) compounds. II. The crystal structure of potassium uranyl sulfate dihydrate, K2UO2(SO4)2*2H2O Acta Chemica Scandinavica A33 621-624 | 1979 | synthetic | 0 | 293 | |
0020465 | Geschieberite | Alekseev E V, Suleimanov E V, Chuprunov E V, Marychev M O, Ivanov V A, Fukin G K (2006) Crystal structure and nonlinear optical properties of the K2UO2(SO4)2*2H2O compound at 293 K Crystallography Reports 51 29-33 | 2006 | Synthetic | 0 | 293 | |
0020741 | Geschieberite | Plasil J, Hlousek J, Kasatkin A V, Skoda R, Novak M, Cejka J (2015) Geschieberite, K2(UO2)(SO4)2(H2O)2, a new uranyl sulfate mineral from Jachymov Mineralogical Magazine 79 205-216 | 2015 | Svornost mine, Jachymov, Czech Republic | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
6.882 Å | (100) |
5.622 Å | (53) |
4.589 Å | (12) |
4.428 Å | (16) |
3.681 Å | (18) |
3.304 Å | (15) |
3.079 Å | (14) |
3.006 Å | (17) |
Comments:
From Type Description.
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 Geschieberite
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 Geschieberite
Related Minerals - Strunz-mindat Grouping
7.EC. | Adolfpateraite | K(UO2)(SO4)(OH)(H2O) |
7.EC. | Beshtauite | (NH4)2(UO2)(SO4)2 · 2H2O |
7.EC. | Seaborgite | LiK2Na6(UO2)(SO4)5(SO3OH)(H2O) |
7.EC. | Nitscheite | (NH4)2[(UO2)2(SO4)3(H2O)2] · 3H2O |
7.EC. | Oldsite | K2Fe2+[(UO2)(SO4)2]2(H2O)8 |
7.EC. | Libbyite | (NH4)2(Na2◻)[(UO2)2(SO4)3(H2O)]2 · 7H2O |
7.EC.05 | Cobaltzippeite | Co(UO2)2(SO4)O2 · 3.5H2O |
7.EC.05 | Magnesiozippeite | Mg(UO2)2(SO4)O2 · 3.5H2O |
7.EC.05 | Nickelzippeite | Ni2(UO2)6(SO4)3(OH)10 · 16H2O |
7.EC.05 | Natrozippeite | Na5(UO2)8(SO4)4O5(OH)3 · 12H2O |
7.EC.05 | Zinczippeite | Zn(UO2)2(SO4)O2 · 3.5H2O |
7.EC.05 | Zippeite | K3(UO2)4(SO4)2O3(OH) · 3H2O |
7.EC.05 | Plavnoite | K0.8Mn0.6[(UO2)2O2(SO4)] · 3.5H2O |
7.EC.05 | Redcanyonite | (NH4)2Mn[(UO2)4O4(SO4)2](H2O)4 |
7.EC.05 | Ammoniozippeite | (NH4)2[(UO2)2(SO4)O2] · H2O |
7.EC.10 | Rabejacite | Ca(UO2)4(SO4)2(OH)6 · 6H2O |
7.EC.10 | Svornostite | K2Mg[(UO2)(SO4)2]2 · 8H2O |
7.EC.15 | Marécottite | Mg3(UO2)8(SO4)4O6(OH)2 · 28H2O |
7.EC.15 | Sejkoraite-(Y) | Y2(UO2)8(SO4)4O6(OH)2 · 26H2O |
7.EC.20 | Pseudojohannite | Cu3(OH)2[(UO2)4(SO4)2] · 12H2O |
7.EC.40 | Bluelizardite | Na7(UO2)(SO4)4Cl(H2O)2 |
7.EC.45 | Meisserite | Na5(UO2)(SO4)3(SO3OH)(H2O) |
7.EC.45 | Fermiite | Na4(UO2)(SO4)3 · 3H2O |
7.EC.45 | Oppenheimerite | Na2(UO2)(SO4)2 · 3H2O |
7.EC.50 | Plášilite | Na(UO2)(SO4)(OH) · 2H2O |
7.EC.50 | Feynmanite | Na(UO2)(SO4)(OH) · 3.5H2O |
7.EC.60 | Ottohahnite | Na6(UO2)2(SO4)5(H2O)7 · 1.5H2O |
7.EC.65 | Péligotite | Na6(UO2)(SO4)4 · 4H2O |
7.EC.70 | Klaprothite | Na6(UO2)(SO4)4 · 4H2O |
7.EC.75 | Lussierite | Na10[(UO2)(SO4)4](SO4)2 · 3(H2O) |
7.EC.80 | Navrotskyite | K2Na10(UO2)3(SO4)9 · 2H2O |
7.EC.85 | Pseudomeisserite-(NH4) | (NH4)2Na4[(UO2)2(SO4)5] · 4H2O |
7.EC.90 | Wetherillite | Na2Mg(UO2)2(SO4)4 · 18H2O |
Fluorescence of Geschieberite
Strong yellowish-green fluorescence under both shortwave and longwave UV.
Other Information
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.
Internet Links for Geschieberite
mindat.org URL:
https://www.mindat.org/min-46101.html
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References for Geschieberite
Reference List:
Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2014) New minerals and nomenclature modifications approved in 2014, CNMNC Newsletter No 20. Mineralogical Magazine, 78 (3) 549-558 doi:10.1180/minmag.2014.078.3.05
Localities for Geschieberite
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).
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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Czech Republic (TL) | |
| Williams et al. (2014) +2 other references |
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Geschieber vein, Svornost Mine, Jáchymov, Karlovy Vary District, Karlovy Vary Region, Czech Republic