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Formula: Mg(U6+O2)2(AsO4)2.8H2O
Hydrated arsenate, uranyl mineral,
meta-autunite group
Crystal System: Tetragonal
Specific gravity: 3.51 measured, 3.72 calculated
Hardness: 2½
Streak: Yellowish white
Colour: Yellow
RADIOACTIVE
Environments
Metanováčekite reversibly dehydrates from nováčekite under ambient
conditions, and is typically pseudomorphous after
nováčekite crystals
(HOM, Mindat).
Localities
At the type locality, the Anton Mine, Heubach Valley, Wittichen, Schenkenzell, Rottweil, Freiburg,
Baden-Württemberg, Germany,
metanováčekite is associated with nováčekite
(HOM).
At the Sue Mine, Bull Canyon, Asbestos Point area, Sierra Ancha Mining District, Sierra Ancha Mountains, Gila
County, Arizona, USA, metanováčekite is associated with bassetite
and saléeite
(HOM).
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