Znucalite
A valid IMA mineral species
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About Znucalite
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 Identifiers
Mindat ID:
4428
Long-form identifier:
mindat:1:1:4428:4
GUID
(UUID V4):
(UUID V4):
942030c1-5c5c-4222-ae2b-990ef8695fec
IMA Classification of Znucalite
Approved
IMA Formula:
CaZn11(UO2)(CO3)3(OH)20 · 4H2O
Approval year:
1989
First published:
1990
Classification of Znucalite
5.ED.45
5 : CARBONATES (NITRATES)
E : Uranyl Carbonates
D : UO2:CO3 = 1:3
5 : CARBONATES (NITRATES)
E : Uranyl Carbonates
D : UO2:CO3 = 1:3
16b.7.14.1
16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
7 : Miscellaneous
16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
7 : Miscellaneous
11.11.20
11 : Carbonates
11 : Carbonates of Cr and U
11 : Carbonates
11 : Carbonates of Cr and U
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 |
---|---|---|
Znu | 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 Znucalite
Silky
Transparency:
Translucent
Colour:
White to light yellow
Streak:
White
Cleavage:
Perfect
{010}
{010}
Density:
3.01 - 3.1 g/cm3 (Measured) 3.15 g/cm3 (Calculated)
Optical Data of Znucalite
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.
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)
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.
Negative elongation.
Type description gives β = 1.620 and 2V (calculated) = 0.
Chemistry of Znucalite
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
the above formula the structural formula; formerly given as Zn12Ca(UO2)(CO3)3(OH)22·4H2O
Crystallography of Znucalite
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)°
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).
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 Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
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 Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 7: Great Oxidation Event | <2.4 |
47a : [Near-surface hydration of prior minerals] | |
47c : [Carbonates, phosphates, borates, nitrates] | |
47f : [Uranyl (U⁶⁺) minerals] | |
Stage 10b: Anthropogenic minerals | <10 Ka |
55 : Anthropogenic mine minerals |
Type Occurrence of Znucalite
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.
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 Znucalite
Other Language Names for Znucalite
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
5.ED. | Paramarkeyite | Ca2(UO2)(CO3)3 · 5H2O |
5.ED. | Pendevilleite-(Y) | Mg2Y3Al(UO2)2(CO3)7(OH)6(H2O)16 |
5.ED.05 | Bayleyite | Mg2(UO2)(CO3)3 · 18H2O |
5.ED.10 | Swartzite | MgCa(UO2)(CO3)3 · 12H2O |
5.ED.15 | Albrechtschraufite | Ca4Mg(UO2)2(CO3)6F2 · 17-18H2O |
5.ED.20 | Liebigite | Ca2(UO2)(CO3)3 · 11H2O |
5.ED.25 | Rabbittite | Ca3Mg3(UO2)2(CO3)6(OH)4 · 18H2O |
5.ED.30 | Andersonite | Na2Ca(UO2)(CO3)3 · 6H2O |
5.ED.35 | Grimselite | K3Na(UO2)(CO3)3 · H2O |
5.ED.40 | Widenmannite | Pb2(OH)2[(UO2)(CO3)2] |
5.ED.50 | Čejkaite | Na4(UO2)(CO3)3 |
5.ED.50 | Agricolaite | K4(UO2)(CO3)3 |
5.ED.55 | Línekite | K2Ca3[(UO2)(CO3)3]2 · 8H2O |
5.ED.55 | Braunerite | K2Ca(UO2)(CO3)3 · 6H2O |
5.ED.60 | Leószilárdite | Na6Mg(UO2)2(CO3)6 · 6H2O |
5.ED.65 | Pseudomarkeyite | Ca8(UO2)4(CO3)12 · 21H2O |
5.ED.65 | Markeyite | Ca9(UO2)4(CO3)13 · 28H2O |
5.ED.65 | Natromarkeyite | Na2Ca8(UO2)4(CO3)13 · 27H2O |
5.ED.70 | Paddlewheelite | MgCa5Cu2(UO2)4(CO3)12(H2O)33 |
Fluorescence of Znucalite
Yellow-green fluorescence with SW and LW UV (from type loc).
Not fluorescent (from Mas d'Alary).
Not fluorescent (from Mas d'Alary).
Other Information
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.
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 Znucalite
mindat.org URL:
https://www.mindat.org/min-4428.html
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Please feel free to link to this page.
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References for Znucalite
Localities for Znucalite
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 | |
| Plášil |
Plášil J. et al. (2008) | |
| Neues Jahrb. Mineral. (1991) +1 other reference |
| Lapis 2002 (7/8) |
Möhn et al. (12/2021) | |
Brent Thorne specimen. SXRD analyzed and acquired from Czechmin (Jakob Plasil) +1 other reference | |
France | |
| Tschernich et al. (1992) +1 other reference |
Germany | |
| Möhn et al. (07/2020) |
| Wittern (2001) |
Switzerland | |
| Meisser (2012) |
USA | |
| Ondrush et al. (authors) +3 other references |
Pete Dunn | |
| Desor (11/2020) |
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Jan Evangelista vein, Svornost Mine, Jáchymov, Karlovy Vary District, Karlovy Vary Region, Czech Republic