Nováčekite
About Nováčekite
This mineral was renamed to nováčekite-II with the Roman numerals indicating hydration/dehydration stages (Walenta 1964) and the diacritical marks were added in 2008 (Burke). Renamed to nováčekite (with diacritics and without Roman numerals) in 2022.
Chemically similar to metanováčekite (the lower hydrate), hydronováčekite (the higher hydrate) and seelite (an arsenite/arsenate).
Note: Hydronováčekite (formerly called nováčekite-I) is very unstable under ambient conditions and quickly dehydrates to nováčekite, in part also to metanováčekite (Walenta, 1964).
Nováčekite may also reversibly rehydrate from metanováčekite under ambient conditions.
Name Encoding
Unique Identifiers
Similar Names
| Novacikit | A synonym of Hydronováčekite |
Classification of Nováčekite
IMA Classification of Nováčekite
8 : PHOSPHATES, ARSENATES, VANADATES
E : Uranyl phosphates and arsenates
B : UO2:RO4 = 1:1
Mineral Symbols
| Symbol | Source | Reference for Standard |
|---|---|---|
| Nvč-II | 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 Nováčekite
{001}
Optical Data of Nováčekite
Based on recorded range of RI values above.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Relative to Canada balsam mounting medium (n ≈ 1.537).
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
No measured or calculated 2V is on file for this mineral, so the value used here (53°) is estimated from its recorded refractive indices and optic sign, not from a direct 2V measurement.
Chemistry of Nováčekite
Crystallography of Nováčekite
β = 90.585(3)°
X-Ray Powder Diffraction
| d-spacing | Intensity |
|---|---|
| 10.2 Å | (100) |
| 6.80 Å | (40) |
| 5.06 Å | (80) |
| 3.58 Å | (90) |
| 3.35 Å | (50) |
| 2.52 Å | (30) |
| 2.26 Å | (30) |
Geological Environment
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] | |
| 47f : [Uranyl (U⁶⁺) minerals] |
Synonyms of Nováčekite
Other Language Names for Nováčekite
Relationship of Nováčekite to other Species
| Autunite | Ca(UO2)2(PO4)2 · 10-12H2O | Orth. mmm(2/m2/m2/m) : Pnma |
| Bassetite | Fe2+(UO2)2(PO4)2 · 10H2O | Mon. 2/m : P21/c |
| Heinrichite | Ba(UO2)2(AsO4)2 · 10H2O | Mon. 2/m : P2/b |
| Hydronováčekite | Mg(UO2)2(AsO4)2 · 12H2O | Tric. 1 : P1 |
| Kahlerite | Fe2+(UO2)2(AsO4)2 · 12H2O | Tet. 4/m : P42/n |
| Rauchite | Ni(UO2)2(AsO4)2 · 10H2O | Tric. 1 : P1 |
| Sabugalite | HAl(UO2)4(PO4)4 · 16H2O | Mon. 2/m : B2/m |
| Saléeite | Mg(UO2)2(PO4)2 · 10H2O | Mon. 2/m : P21/c |
| Torbernite | Cu(UO2)2(PO4)2 · 12H2O | Tet. 4/mmm(4/m2/m2/m) : I4/mmm |
| Uranocircite | Ba(UO2)2(PO4)2 · 10H2O | Tet. |
| Uranospinite | Ca(UO2)2(AsO4)2 · 10H2O | Tet. 4/mmm(4/m2/m2/m) : P4/nmm |
| Zeunerite | Cu(UO2)2(AsO4)2 · 12H2O | Tet. 4/mmm(4/m2/m2/m) : I4/mmm |
Common Associates
| 8 photos of Nováčekite associated with Sklodowskite | Mg(UO2)2(SiO3OH)2 · 6H2O |
| 6 photos of Nováčekite associated with Tyuyamunite | Ca(UO2)2(VO4)2 · 5-8H2O |
| 5 photos of Nováčekite associated with Zeunerite | Cu(UO2)2(AsO4)2 · 12H2O |
| 5 photos of Nováčekite associated with Erythrite | Co3(AsO4)2 · 8H2O |
| 5 photos of Nováčekite associated with Aragonite | CaCO3 |
| 4 photos of Nováčekite associated with Gypsum | CaSO4 · 2H2O |
| 3 photos of Nováčekite associated with Umohoite | (UO2)MoO4 · 2H2O |
| 3 photos of Nováčekite associated with Quartz | SiO2 |
| 3 photos of Nováčekite associated with Hematite | Fe2O3 |
| 3 photos of Nováčekite associated with Calcite | CaCO3 |
Related Minerals - Strunz-mindat Grouping
| 8.EB. | Meta-autunite Group | A1-2(UO2)2(TO4)2 · 5-10H2O |
| 8.EB.05 | Rauchite | Ni(UO2)2(AsO4)2 · 10H2O |
| 8.EB.05 | Uranocircite | Ba(UO2)2(PO4)2 · 10H2O |
| 8.EB.05 | Uranospinite | Ca(UO2)2(AsO4)2 · 10H2O |
| 8.EB.05 | Zeunerite | Cu(UO2)2(AsO4)2 · 12H2O |
| 8.EB.05 | Metarauchite | Ni(UO2)2(AsO4)2 · 8H2O |
| 8.EB.05 | Heinrichite | Ba(UO2)2(AsO4)2 · 10H2O |
| 8.EB.05 | Kahlerite | Fe2+(UO2)2(AsO4)2 · 12H2O |
| 8.EB.05 | Hydronováčekite | Mg(UO2)2(AsO4)2 · 12H2O |
| 8.EB.05 | Torbernite | Cu(UO2)2(PO4)2 · 12H2O |
| 8.EB.05 | Autunite | Ca(UO2)2(PO4)2 · 10-12H2O |
| 8.EB.05 | Saléeite | Mg(UO2)2(PO4)2 · 10H2O |
| 8.EB.05 | Xiangjiangite | (Fe3+,Al)(UO2)4(PO4)2(SO4)2(OH) · 22H2O |
| 8.EB.10 | Bassetite | Fe2+(UO2)2(PO4)2 · 10H2O |
| 8.EB.10 | Lehnerite | Mn2+(UO2)2(PO4)2 · 8H2O |
| 8.EB.10 | Meta-autunite | Ca(UO2)2(PO4)2 · 6H2O |
| 8.EB.10 | Metasaléeite | Mg(UO2)2(PO4)2 · 8H2O |
| 8.EB.10 | Metauranocircite | Ba(UO2)2(PO4)2 · 7H2O |
| 8.EB.10 | Metauranospinite | Ca(UO2)2(AsO4)2 · 8H2O |
| 8.EB.10 | Metaheinrichite | Ba(UO2)2(AsO4)2 · 8H2O |
| 8.EB.10 | Metakahlerite | Fe2+(UO2)2(AsO4)2 · 8H2O |
| 8.EB.10 | Metakirchheimerite | Co(UO2)2(AsO4)2 · 8H2O |
| 8.EB.10 | Metanováčekite | Mg(UO2)2(AsO4)2 · 8H2O |
| 8.EB.10 | Metanatroautunite | Na(UO2)(PO4)(H2O)3 |
| 8.EB.10 | Metatorbernite | Cu(UO2)2(PO4)2 · 8H2O |
| 8.EB.10 | Metazeunerite | Cu(UO2)2(AsO4)2 · 8H2O |
| 8.EB.10 | Przhevalskite | Pb2(UO2)3(PO4)2(OH)4 · 3H2O |
| 8.EB.10 | 'Pseudo-autunite' | (H3O)4Ca2(UO2)2(PO4)4 · 5H2O |
| 8.EB.15 | Abernathyite | K(UO2)(AsO4) · 3H2O |
| 8.EB.15 | Uramphite | (NH4)2(UO2)2(PO4)2 · 6H2O |
| 8.EB.15 | Meta-ankoleite | K2(UO2)2(PO4)2 · 6H2O |
| 8.EB.15 | Natrouranospinite | Na2(UO2)2(AsO4)2 · 5H2O |
| 8.EB.15 | Trögerite | (H3O)(UO2)(AsO4) · 3H2O |
| 8.EB.15 | Chernikovite | (H3O)2(UO2)2(PO4)2 · 6H2O |
| 8.EB.15 | Uramarsite | (NH4)(UO2)(AsO4) · 3H2O |
| 8.EB.20 | Chistyakovaite | Al(UO2)2(AsO4)2(F,OH) · 6.5H2O |
| 8.EB.20 | Threadgoldite | Al(UO2)2(PO4)2(OH) · 8H2O |
| 8.EB.25 | Uranospathite | (Al,◻)(UO2)2(PO4)2F · 20(H2O,F) |
| 8.EB.25 | Arsenuranospathite | Al(UO2)2(AsO4)2F · 20H2O |
| 8.EB.30 | Vochtenite | (Fe2+,Mg)Fe3+(UO2)4(PO4)4(OH) · 12-13H2O |
| 8.EB.35 | Coconinoite | Fe3+2Al2(UO2)2(PO4)4(SO4)(OH)2 · 20H2O |
| 8.EB.40 | Ranunculite | HAl(UO2)(PO4)(OH)3 · 4H2O |
| 8.EB.45 | Triangulite | Al3(UO2)4(PO4)4(OH)5 · 5H2O |
| 8.EB.50 | Furongite | Al13(UO2)7(PO4)13(OH)14 · 58H2O |
| 8.EB.55 | Arsenosabugalite | H0.5Al0.5(UO2)2(AsO4)2 · 8H2O |
| 8.EB.55 | Sabugalite | HAl(UO2)4(PO4)4 · 16H2O |
| 8.EB.60 | Horákite | (Bi7O7OH)[(UO2)4(PO4)2(AsO4)2(OH)2] · 3.5H2O |
Radioactivity
| Element | % Content | Activity (Bq/kg) | Radiation Type |
|---|---|---|---|
| Uranium (U) | 46.5650% | 11,641,250 | α, β, γ |
| Thorium (Th) | 0.0000% | 0 | α, β, γ |
| Potassium (K) | 0.0000% | 0 | β, γ |
For comparison:
- Banana: ~15 Bq per fruit
- Granite: 1,000–3,000 Bq/kg
- EU exemption limit: 10,000 Bq/kg
Note: Risk is shown relative to daily recommended maximum exposure to non-background radiation of 1000 µSv/year. Note that natural background radiation averages around 2400 µSv/year so in reality these risks are probably extremely overstated! With infrequent handling and safe storage natural radioactive minerals do not usually pose much risk.
Note: The mass selector refers to the mass of radioactive mineral present, not the full specimen, also be aware that the matrix may also be radioactive, possibly more radioactive than this mineral!
Activity: –
| Distance | Dose rate | Risk |
|---|---|---|
| 1 cm | ||
| 10 cm | ||
| 1 m |
The external dose rate (D) from a radioactive mineral is estimated by summing the gamma radiation contributions from its Uranium, Thorium, and Potassium content, disregarding daughter-product which may have a significant effect in some cases (eg 'pitchblende'). This involves multiplying the activity (A, in Bq) of each element by its specific gamma ray constant (Γ), which accounts for its unique gamma emissions. The total unshielded dose at 1 cm is then scaled by the square of the distance (r, in cm) and multiplied by a shielding factor (μshield). This calculation provides a 'worst-case' or 'maximum risk' estimate because it assumes the sample is a point source and entirely neglects any self-shielding where radiation is absorbed within the mineral itself, meaning actual doses will typically be lower. The resulting dose rate (D) is expressed in microsieverts per hour (μSv/h).
D = ((AU × ΓU) + (ATh × ΓTh) + (AK × ΓK)) / r2 × μshield
Fluorescence of Nováčekite
Other Information
Internet Links for Nováčekite
Please feel free to link to this page.
References for Nováčekite
Localities for Nováčekite
Showing 28 localities.
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).
All localities listed without proper references should be considered as questionable.
Austria | |
| Strasser (1989) |
| Strasser (1989) | |
Brazil | |
| King (n.d.) |
Czech Republic | |
| 70 (in German) +1 other reference |
| Hyrsl et al. (2009) |
France | |
| Meisser (2012) |
| Bariand et al. (1993) +1 other reference |
Germany | |
| Walenta (1980) +3 other references |
| Walenta et al. (1961) +1 other reference |
| Ko Jansen collection +2 other references |
Greece | |
| Rieck et al. (2018) +1 other reference |
Italy | |
| Marello et al. (2013) |
| Marello et al. (2013) | |
Mexico | |
| Megaw (2023) |
Morocco | |
| ONA |
| Favreau et al. (2019) | |
| Favreau et al. (2007) |
Poland | |
| Syczewski et al. (2023) |
Romania | |
| Hîrtopanu P. et al. (2004) |
Russia | |
| Pekov I.V. et al. (2010) |
Slovakia | |
| Ondrejka et al. (2024) |
Switzerland | |
| Ansermet (2012) |
UK | |
| Livingstone (1993) |
USA | |
| Dostal (2023) |
| Eric Quinter collection |
| R. E. Cohenour (1960) |
| Page et al. (1956) +3 other references |
| Collected and analyzed by Joy Desor. |






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Clara Mine, Oberwolfach, Ortenaukreis, Freiburg Region, Baden-Württemberg, Germany