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Znucalite

A valid IMA mineral species
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About ZnucaliteHide

Formula:
Zn10Ca0.83(UO2)0.83(CO3)4(OH)15.31(H2O)5.48
the above formula the structural formula; formerly given as Zn12Ca(UO2)(CO3)3(OH)22·4H2O
Colour:
White to light yellow
Lustre:
Silky
Specific Gravity:
3.01 - 3.1
Crystal System:
Monoclinic
Name:
Named in 1990 by Petr Ondruš, František Veselovský, and R. Rybka for its chemical composition containing Zinc (Zn), Uranium (U) and Calcium (Ca).
The layered structure is based on [Zn10(OH)14(CO3)2] double sheet, with both octahedral and tetrahedral Zn. The thick interlayer bears Ca ions and uranyl and water groups. Ordering of Ca and U varies which is suggested to cause issues with solving the structure.


Unique IdentifiersHide

Mindat ID:
4428
Long-form identifier:
mindat:1:1:4428:4
GUID
(UUID V4):
942030c1-5c5c-4222-ae2b-990ef8695fec

IMA Classification of ZnucaliteHide

Classification of ZnucaliteHide

5.ED.45

5 : CARBONATES (NITRATES)
E : Uranyl Carbonates
D : UO2:CO3 = 1:3
16b.7.14.1

16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
7 : Miscellaneous
11.11.20

11 : Carbonates
11 : Carbonates of Cr and U

Mineral SymbolsHide

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

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

Physical Properties of ZnucaliteHide

Silky
Transparency:
Translucent
Colour:
White to light yellow
Streak:
White
Cleavage:
Perfect
{010}
Density:
3.01 - 3.1 g/cm3 (Measured)    3.15 g/cm3 (Calculated)

Optical Data of ZnucaliteHide

Type:
Biaxial (-)
RI values:
nα = 1.556 - 1.563 nβ = 1.600 nγ = 1.620 - 1.621
2V:
Measured: 50° to 66°, Calculated: 66.4°
Max Birefringence:
δ = 0.064
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
strong
Optical Extinction:
Extinction inclined about 9° (type description)
Parallel extinction (Mas d'Alary, France)
Comments:
X = c; Y = b; Z = a.
Negative elongation.

Type description gives β = 1.620 and 2V (calculated) = 0.

Chemistry of ZnucaliteHide

Mindat Formula:
Zn10Ca0.83(UO2)0.83(CO3)4(OH)15.31(H2O)5.48

the above formula the structural formula; formerly given as Zn12Ca(UO2)(CO3)3(OH)22·4H2O

Crystallography of ZnucaliteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Setting:
P21/m
Cell Parameters:
a = 10.722(2) Å, b = 6.259(1) Å, c = 25.355(1) Å
β = 101.13(1)°
Ratio:
a:b:c = 1.713 : 1 : 4.051
Unit Cell V:
1,669.55 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Crystals are thin lamellar, to 100 µm, in spherical boxworklike aggregates; forms coatings.
From Mas d'Alary, France, crystals are elongate [001] and platy on (010).
Comment:
Cell parameters from Steciuk et al. (2023). They differ significantly from the type description which was thought to be triclinic..

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
25.10 Å(62)
6.141 Å(78)
5.650 Å(54)
3.165 Å(70)
2.728 Å(90)
2.708 Å(100)
2.682 Å(56)
1.5820 Å(77)
1.5600 Å(62)
1.5561 Å(67)

Geological EnvironmentHide

Paragenetic Mode(s):

Type Occurrence of ZnucaliteHide

General Appearance of Type Material:
Porous coatings of saucer-shaped aggregates, up to 10 cm2, some consisting of thin plates averaging 15 x 8 x 0.4 um.
Place of Conservation of Type Material:
1) National Museum, Prague, Czech Republic.
2) Faculty of Natural Sciences of Charles University, Prague, Czech Republic.
3) The Regional Museum, Pribram, Czech Republic.
Geological Setting of Type Material:
Oxidation product on uraninite-bearing dump material.
Associated Minerals at Type Locality:
Reference:
Ondruš, P., Veselovský, F., Rybka, R. (1990) Znucalite, Zn12(UO2)Ca(CO3)3(OH)22·4H2O, a new mineral from Príbram, Czechoslovakia. Neues Jahrbuch für Mineralogie, Monatshefte: 1990: 393-400.

Synonyms of ZnucaliteHide

Other Language Names for ZnucaliteHide

German:Znucalit
Spanish:Znucalita

Common AssociatesHide

Associated Minerals Based on Photo Data:
5 photos of Znucalite associated with HydrozinciteZn5(CO3)2(OH)6
4 photos of Znucalite associated with CalciteCaCO3
2 photos of Znucalite associated with DolomiteCaMg(CO3)2

Related Minerals - Strunz-mindat GroupingHide

5.ED.ParamarkeyiteCa2(UO2)(CO3)3 · 5H2OMon. 2/m
5.ED.Pendevilleite-(Y)Mg2Y3Al(UO2)2(CO3)7(OH)6(H2O)16Tric. 1 : P1
5.ED.05BayleyiteMg2(UO2)(CO3)3 · 18H2OMon. 2/m : P21/b
5.ED.10SwartziteMgCa(UO2)(CO3)3 · 12H2OMon. 2/m : P21/m
5.ED.15AlbrechtschraufiteCa4Mg(UO2)2(CO3)6F2 · 17-18H2OTric. 1 : P1
5.ED.20LiebigiteCa2(UO2)(CO3)3 · 11H2OOrth. mm2
5.ED.25RabbittiteCa3Mg3(UO2)2(CO3)6(OH)4 · 18H2OMon.
5.ED.30AndersoniteNa2Ca(UO2)(CO3)3 · 6H2OTrig. 3 : R3
5.ED.35GrimseliteK3Na(UO2)(CO3)3 · H2OHex. 6 m2 : P62c
5.ED.40WidenmannitePb2(OH)2[(UO2)(CO3)2]Orth.
5.ED.50ČejkaiteNa4(UO2)(CO3)3Mon. m : Bb
5.ED.50AgricolaiteK4(UO2)(CO3)3Mon. 2/m : B2/b
5.ED.55LínekiteK2Ca3[(UO2)(CO3)3]2 · 8H2OOrth. mmm (2/m 2/m 2/m) : Pnnm
5.ED.55BrauneriteK2Ca(UO2)(CO3)3 · 6H2OMon. 2/m : P21/b
5.ED.60LeószilárditeNa6Mg(UO2)2(CO3)6 · 6H2OMon. 2/m : B2/m
5.ED.65PseudomarkeyiteCa8(UO2)4(CO3)12 · 21H2OMon. 2/m : P21/m
5.ED.65MarkeyiteCa9(UO2)4(CO3)13 · 28H2OOrth. mmm (2/m 2/m 2/m) : Pmmn
5.ED.65NatromarkeyiteNa2Ca8(UO2)4(CO3)13 · 27H2OOrth. mmm (2/m 2/m 2/m) : Pmmn
5.ED.70PaddlewheeliteMgCa5Cu2(UO2)4(CO3)12(H2O)33Mon. m : Pb

Fluorescence of ZnucaliteHide

Yellow-green fluorescence with SW and LW UV (from type loc).
Not fluorescent (from Mas d'Alary).

Other InformationHide

Notes:
Readily soluble in acid, with evolution of CO2.
Radioactive.
Raman Spectroscopy confirms, i.a., presence of (several non-equivalent) carbonate groups, OH anions, and water.
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 ZnucaliteHide

References for ZnucaliteHide

Localities for ZnucaliteHide

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
 
  • Central Bohemian Region
    • Příbram District
      • Háje
Plášil
Plášil J. et al. (2008)
      • Příbram
        • Březové Hory
          • Černojamské deposit
Neues Jahrb. Mineral. (1991) +1 other reference
  • Karlovy Vary Region
    • Karlovy Vary District
Lapis 2002 (7/8)
Möhn et al. (12/2021)
Brent Thorne specimen. SXRD analyzed and acquired from Czechmin (Jakob Plasil) +1 other reference
France
 
  • Occitanie
    • Hérault
      • Lodève
        • Lodève
Tschernich et al. (1992) +1 other reference
Germany
 
  • Saxony
    • Erzgebirgskreis
      • Annaberg-Buchholz
        • Kleinrückerswalde
Möhn et al. (07/2020)
    • Sächsische Schweiz-Osterzgebirge
      • Glashütte
        • Bärenhecke
Wittern (2001)
Switzerland
 
  • Valais
    • Saint-Maurice
      • Finhaut
        • Giétroz
Meisser (2012)
USA
 
  • New Jersey
    • Sussex County
      • Ogdensburg
        • Sterling Hill
Ondrush et al. (authors) +3 other references
Pete Dunn
  • Utah
    • San Juan County
      • White Canyon Mining District
Desor (11/2020)
 
Mineral and/or Locality  
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