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Nováčekite-II

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Formula:
Mg(UO
 
2
)
 
2
(AsO
 
4
)
 
2
 · 10H
 
2
O
System:Monoclinic


See nováčekite and nováčekite-I.

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-II

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
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Crystallography of Nováčekite-II

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 Volume:V 1,025.26 ų (Calculated from Unit Cell)
Comment:SG P21/n; pseudotetragonal ((pseudo-space group P42/n, a = 7.18-7.20 A, c = 20.16-20.22 A, Z = 2).

Chemical Properties of Nováčekite-II

Formula:
Mg(UO
 
2
)
 
2
(AsO
 
4
)
 
2
 · 10H
 
2
O
Essential elements:As, H, Mg, O, U
All elements listed in formula:As, H, Mg, O, U

Other Information

Health Warning: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-II

Reference List:

- +
Walenta, K. & Wimmenauer, W. (1961): Der Mineralbestand des Michaelganges im Weiler bei Lahr (Schwarzwald). Jh. Geol. Landesamt Baden-Württemberg, 4, 7-37.

Walenta, K. (1964): Rare arsenate minerals with special consideration of occurrences in the Black Forest. Mineral. Petrog. Mitt. 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.

Internet Links for Nováčekite-II

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    • Localities for Nováčekite-II

    The 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.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    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
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