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Nováčekite-II

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About Nováčekite-IIHide

Radim Novacek
Formula:
Mg(UO2)2(AsO4)2 · 10H2O
Colour:
Pale yellow, Yellow
Lustre:
Resinous, Waxy
Hardness:
2 - 2½
Specific Gravity:
3.25 - 3.70
Crystal System:
Monoclinic
Member of:
Name:
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
Transparency:
Translucent
Colour:
Pale yellow, Yellow
Streak:
Very pale yellow
Hardness:
2 - 2½ on Mohs scale
Tenacity:
Waxy
Cleavage:
Perfect
{001}
Fracture:
Micaceous
Density:
3.25 - 3.70 g/cm3 (Measured)    3.27 g/cm3 (Calculated)

Optical Data of Nováčekite-IIHide

Type:
Biaxial (-)
RI values:
nα = 1.543 nβ = 1.570 nγ = 1.577 nω = 1.578 nε = 1.548
Birefringence:
0.032
Max Birefringence:
δ = 0.030
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
r>v, strong
Pleochroism:
Visible
Comments:
X = nearly colorless, Y = Z = pale yellow to pale yellow green

Chemical Properties of Nováčekite-IIHide

Formula:
Mg(UO2)2(AsO4)2 · 10H2O

Crystallography of Nováčekite-IIHide

Crystal System:
Monoclinic
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)°
Ratio:
a:b:c = 0.355 : 1 : 0.356
Unit Cell V:
1,025.26 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Square tablets
Comment:
SG 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:
d-spacingIntensity
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.
Germany
 
  • 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)
      • 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
Greece
 
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium; Lavreotiki Municipality)
      • Lavrion District Mines
        • Paleokamariza area
          • 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).
Italy
 
  • 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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