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About Nováčekite-IIHide

Radim Novacek
Mg(UO2)2(AsO4)2 · 10H2O
Pale yellow, Yellow
Resinous, Waxy
2 - 2½
Specific Gravity:
3.25 - 3.70
Crystal System:
Member of:
Named novacekite in 1951 by Clifford Frondel in honor of Radim Nováček [March 21, 1905 Ústí Nad Orlicí, Bohemia, Austria-Hungary - February 12, 1942 Mauthausen, Austria] mineralogist and analytical chemist, Charles University, Prague, Czech Republic. The Roman numerals were later added to indicate hydration/dehydration stages (Walenta 1964) and the diacritical marks were added in 2008 (Burke).
Isostructural with:
See nováčekite and nováčekite-I. Chemically similar to metanováčekite (the lower hydrate) and seelite (an arsenite/arsenate).

Nováčekite-I is very unstable under ambient conditions and quickly dehydrates to nováčekite-II, in part also to metanováčekite.
Nováčekite-II may also reversibly rehydrate from metanováčekite under ambient conditions.

Classification of Nováčekite-IIHide

Approved, 'Grandfathered' (first described prior to 1959)

Physical Properties of Nováčekite-IIHide

Resinous, Waxy
Pale yellow, Yellow
Very pale yellow
2 - 2½ on Mohs scale
3.25 - 3.70 g/cm3 (Measured)    3.27 g/cm3 (Calculated)

Optical Data of Nováčekite-IIHide

Biaxial (-)
RI values:
nα = 1.543 nβ = 1.570 nγ = 1.577 nω = 1.578 nε = 1.548
Max Birefringence:
δ = 0.030
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
r>v, strong
X = nearly colorless, Y = Z = pale yellow to pale yellow green

Chemical Properties of Nováčekite-IIHide

Mg(UO2)2(AsO4)2 · 10H2O

Crystallography of Nováčekite-IIHide

Crystal System:
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 7.1328(11) Å, b = 20.085(3) Å, c = 7.1569(11) Å
β = 90.585(3)°
a:b:c = 0.355 : 1 : 0.356
Unit Cell V:
1,025.26 ų (Calculated from Unit Cell)
Square tablets
Space group P21/n; pseudotetragonal (pseudo-space group P42/n, a = 7.18-7.20 A, c = 20.16-20.22 A, Z = 2).

X-Ray Powder DiffractionHide

Powder Diffraction Data:
10.2 (100)
6.80 (40)
5.06 (80)
3.58 (90)
3.35 (50)
2.52 (30)
2.26 (30)

Relationship of Nováčekite-II to other SpeciesHide

Member of:
Other Members of this group:
AutuniteCa(UO2)2(PO4)2 · 11H2OOrth. mmm (2/m 2/m 2/m) : Pnma
BassetiteFe2+(UO2)2(PO4)2 · 10H2OMon. 2/m
HeinrichiteBa(UO2)2(AsO4)2 · 10H2OMon. 2/m
KahleriteFe(UO2)2(AsO4)2 · 12H2OTet. 4/m : P42/n
MetarauchiteNi(UO2)2(AsO4)2 · 8H2OTric. 1 : P1
Nováčekite-IMg(UO2)2(AsO4)2 · 12H2OTric. 1 : P1
RauchiteNi(UO2)2(AsO4)2 · 10H2OTric. 1 : P1
SabugaliteHAl(UO2)4(PO4)4 · 16H2OMon. 2/m : B2/m
SaléeiteMg(UO2)2(PO4)2 · 10H2OMon. 2/m : P21/b
TorberniteCu(UO2)2(PO4)2 · 12H2OTet. 4/mmm (4/m 2/m 2/m) : I4/mmm
UranocirciteBa(UO2)2(PO4)2 · 10H2OTet.
UranospiniteCa(UO2)(AsO4)2 · 10H2OTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
ZeuneriteCu(UO2)2(AsO4)2 · 12H2OTet. 4/mmm (4/m 2/m 2/m) : I4/mmm

Fluorescence of Nováčekite-IIHide

Fluoresces dull green to bright lemon yellow in both LW and SW.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Nováčekite-IIHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Walenta, K., Wimmenauer, W. (1961) Der Mineralbestand des Michaelganges im Weiler bei Lahr (Schwarzwald). Jahreshefte des Geologischen Landesamtes in Baden-Württemberg: 4: 7-37.
Walenta, K. (1964) Rare arsenate minerals with special consideration of occurrences in the Black Forest. Mineralogische und Petrographische Mittheilungen: 9: 111-174. (in German).
Locock, A.J., Burns, P.C., Flynn, T.M. (2004) Divalent transition metals and magnesium in structures that contain the autunite-type sheet. Canadian Mineralogist: 42: 1699-1718.
Burke, E.A.J. (2008) Tidying up mineral names: an IMA-CNMNC scheme for suffixes, hyphens and diacritical marks. The Mineralogical Record: 39: 131-135.

Internet Links for Nováčekite-IIHide

Localities for Nováčekite-IIHide

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 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
  • Baden-Württemberg
    • Black Forest
      • Lahr
        • Reichenbach
          • Weiler
Walenta, K. & Wimmenauer, W. (1961): Der Mineralbestand des Michaelganges im Weiler bei Lahr (Schwarzwald). Jh. Geol. Landesamt Baden-Württemberg, 4, 7-37. (in German)
    • Freiburg
      • Ortenaukreis
        • Wolfach
          • Oberwolfach
            • Rankach valley
WALENTA, K. (1992): "Die Mineralien des Schwarzwaldes"; Gröbner, J., Kolitsch, U. und Bayerl, R. (2005): Interessante Uranmineralien im Stinkspat der Grube Clara. Lapis 30 (10), 34-39; 90; Gröbner, J., Bayerl, R. und Kolitsch, U. (2006): Weitere Beobachtungen zu den Uran- und Vanadium-Paragenesen der Grube Clara aus den Jahren 2002, 2004 und 2005. Erzgräber 20, 1-10
  • Attica
    • East Attica
      • Lavreotiki
        • Lavrion District Mines
          • Paliokamariza area (Paleokamariza area)
            • Paliokamariza Mines (Paleokamariza Mines)
Rieck, B., Kolitsch, U., Voudouris, P., Giester, G. and Tzeferis, P. (2018): Weitere Neufunde aus Lavrion, Griechenland. Mineralien-Welt 29 (5), 32-77 (in German).
  • Piedmont
    • Cuneo Province
      • Bagnolo Piemonte
- Marello, B., Finello, G., Bittarello, E., Ciriotti, M.E. (2013). Novacekite-II: novità uranifera alla cava Rocche Grana di Montoso. Micro, 11, 82-87.
Mineral and/or Locality  
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