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Kroupaite

A valid IMA mineral species
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About KroupaiteHide

Formula:
KPb0.5[(UO2)8O4(OH)10] · 10H2O
Colour:
Orange-yellow
Lustre:
Vitreous
Hardness:
2
Specific Gravity:
5.058 (Calculated)
Crystal System:
Orthorhombic
Name:
The new mineral is named after mining engineer Gustav Kroupa (born 30 August 1857 in Mutějovice near Rakovník, Bohemia, died 31 May 1935 in Vienna, Austria), mining engineer, in 1896 he became the head of the k.k. Uranfarbenfabrik in St. Joachimsthal (Jáchymov) until 1900. He approved and sent 10 tons of leachates after processing of uranium ore for uranium pigments to Marie-Curie Sklodowska and Pierre Curie, who were the first to discover and isolate 3 grams of RaCl2 from them.
Structurally related to leesite and metaschoepite.

Belongs to a group of minerals that may be important in uptaking radionuclides like 90Sr or 135Cs.


Unique IdentifiersHide

Mindat ID:
51971
Long-form identifier:
mindat:1:1:51971:7
GUID
(UUID V4):
1592bbe4-f784-43ba-8ef9-3deaf12253a4

IMA Classification of KroupaiteHide

Classification of KroupaiteHide

4.GB.85

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
G : Uranyl Hydroxides
B : With additional cations (K, Ca, Ba, Pb, etc.); with mainly UO2(O,OH)5 pentagonal polyhedra

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
KpaIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of KroupaiteHide

Vitreous
Transparency:
Translucent
Colour:
Orange-yellow
Streak:
Light yellow
Hardness:
Hardness Data:
Measured
Comment:
Scratch tests
Tenacity:
Brittle
Cleavage:
Perfect
{100}
Fracture:
Irregular/Uneven
Density:
5.058 g/cm3 (Calculated)
Comment:
Not measured due to limited amount of materal. Calculated from empirical formula.

Optical Data of KroupaiteHide

Type:
Biaxial (-)
RI values:
nα = 1.691(2) nβ = 1.752(2) nγ = 1.768(2)
2V:
Measured: 53° (1), Calculated: 52.7°
Max Birefringence:
δ = 0.077
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Pleochroism:
Visible
Comments:
X = colorless, Y = yellow, Z = yellow; X < Y ≈ Z
Comments:
X = a, Y = c, Z = b

Chemistry of KroupaiteHide

Mindat Formula:
KPb0.5[(UO2)8O4(OH)10] · 10H2O

Crystallography of KroupaiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pbca
Setting:
Pbca
Cell Parameters:
a = 14.8201(8) Å, b = 14.0958(8) Å, c = 16.765(1) Å
Ratio:
a:b:c = 1.051 : 1 : 1.189
Unit Cell V:
3,502.23 ų (Calculated from Unit Cell)
Morphology:
Tablets flattened on {100}, with prominent forms {100}, {013} and {021}.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
7.407 Å(100)
3.602 Å(59)
3.224 Å(78)
2.572 Å(16)
2.035 Å(21)
1.978 Å(11)
1.798 Å(10)
1.747 Å(7)
Comments:
From Type Description.

Geological EnvironmentHide

Paragenetic Mode(s):

Type Occurrence of KroupaiteHide

General Appearance of Type Material:
Radial aggregates of thick platy, orange-yellow crystals, up to 1 mm, growing in interstices of gypsum crystals
Place of Conservation of Type Material:
Type material is deposited in the mineralogical collections of the National Museum in Prague, Czech Republic, catalogue number no. P1P 16/ 2017, and the Natural History Museum of Los Angeles County, Los Angeles, CA, USA, catalogue number 66572.
Associated Minerals at Type Locality:
Reference:
Plášil, J., Kampf, A.R., Olds, T.A., Sejkora, J., Škoda, R., Burns, P.C. and Čejka, J. (2020) The new K, Pb-bearing uranyl-oxide mineral kroupaite: Crystal-chemical implications for the structures of uranyl-oxide hydroxy-hydrates. American Mineralogist: 105: 561-568.

Synonyms of KroupaiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
2 photos of Kroupaite associated with Jáchymovite(UO2)8(SO4)(OH)14 · 13H2O
1 photo of Kroupaite associated with Uranopilite(UO2)6(SO4)O2(OH)6 · 14H2O
1 photo of Kroupaite associated with GypsumCaSO4 · 2H2O
1 photo of Kroupaite associated with FourmarieritePb(UO2)4O3(OH)4 · 4H2O
1 photo of Kroupaite associated with CompreignaciteK2(UO2)6O4(OH)6 · 7H2O
1 photo of Kroupaite associated with SklodowskiteMg(UO2)2(SiO3OH)2 · 6H2O
1 photo of Kroupaite associated with UraniniteUO2

Related Minerals - Strunz-mindat GroupingHide

4.GB.05AgrinieriteK2(Ca,Sr)[(UO2)3O3(OH)2]2 · 5H2OMon. m : Bm
4.GB.05CompreignaciteK2(UO2)6O4(OH)6 · 7H2OOrth. mmm (2/m 2/m 2/m) : Pnnm
4.GB.05RameauiteK2Ca(UO2)6O6(OH)4 · 6H2OMon. m : Bb
4.GB.10BecquereliteCa(UO2)6O4(OH)6 · 8H2OOrth. mm2 : Pna21
4.GB.10BillietiteBa(UO2)6O4(OH)6 · 4-8H2OOrth. mm2
4.GB.10ProtasiteBa(UO2)3O3(OH)2 · 3H2OMon. m
4.GB.15Richetite(Fe3+,Mg)Pb 8.6(UO2)36O36(OH)24 · 41H2O Tric. 1 : P1
4.GB.20BauranoiteBa(UO2)2(OH)6 · 1-2H2O
4.GB.20Calciouranoite(Ca,Ba,Pb)U2O7 · 5H2O
4.GB.20Metacalciouranoite(Ca,Ba,Pb,K2)U2O7 · 2H2O
4.GB.25FourmarieritePb(UO2)4O3(OH)4 · 4H2OOrth. mm2
4.GB.30WölsendorfitePb7(UO2)14O19(OH)4 · 12H2OOrth. mmm (2/m 2/m 2/m) : Cmcm
4.GB.35MasuyitePb(UO2)3O3(OH)2 · 3H2OOrth. mmm (2/m 2/m 2/m)
4.GB.40MetavandendriesscheitePbU7O22 · nH2O n < 12Orth.
4.GB.40VandendriesscheitePbU7O22 · 12H2OOrth. mmm (2/m 2/m 2/m) : Pbca
4.GB.45VandenbrandeiteCu(UO2)(OH)4Tric. 1 : P1
4.GB.50SayritePb2(UO2)5O6(OH)2 · 4H2OMon. 2/m
4.GB.55CuritePb3(H2O)2[(UO2)4O4(OH)3]2Orth. mmm (2/m 2/m 2/m) : Pnma
4.GB.60Iriginite(UO2)Mo2O7 · 3H2OOrth. mmm (2/m 2/m 2/m) : Pbcm
4.GB.65UranosphaeriteBi(UO2)O2(OH)Mon. 2/m
4.GB.70HolfertiteCaxU6+2-xTi(O8-xOH4x) · 3H2OTrig. 3 : P3
4.GB.75Carlosbarbosaite(UO2)2Nb2O6(OH)2 · 2H2OOrth. mmm (2/m 2/m 2/m) : Cmcm
4.GB.80GauthieriteKPb[(UO2)7O5(OH)7] · 8H2OMon. 2/m : P21/b
4.GB.90LeesiteK(H2O)2[(UO2)4O2(OH)5] · 3H2OOrth. mmm (2/m 2/m 2/m) : Pbca
4.GB.95ShinkolobweitePb1.25[U5+(H2O)2(U6+O2)5O8(OH)2](H2O)5Orth. mmm (2/m 2/m 2/m) : Pnnm
4.GB.95NollmotziteMg[U5+(U6+O2)2O4F3] · 4H2OMon. m : Bm

Fluorescence of KroupaiteHide

Not fluorescent

Other InformationHide

Notes:
Soluble in dilute HCl, with no effervescence
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 KroupaiteHide

References for KroupaiteHide

Localities for KroupaiteHide

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 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.
Czech Republic
 
  • Karlovy Vary Region
    • Karlovy Vary District
      • Jáchymov
Möhn et al. (12/2021)
Plášil et al. (2020)
Desor (04/2022)
Germany
 
  • Baden-Württemberg
    • Freiburg Region
      • Waldshut
        • St Blasien
          • Menzenschwand
Carsten Slotta sample
  • Saxony
    • Erzgebirgskreis
Gerstenberg et al. (11/21) +1 other reference
 
Mineral and/or Locality  
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