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Formula: Ca2Cu(UO2)(CO3)4.6H2O
or
Ca2Cu2+(U6+O2)2+[(CO3)2-]4.6H2O
Hydrated carbonate, uranyl mineral
Crystal System: Monoclinic
Specific gravity: 2.8 measured, 3.06 calculated (we expect the measured value to be less than the calculated value
since uranium, mass number 238, continuously alters to lead, mass number 207, by several stages of radioactive decay)
Streak: Light green
Colour: Bright grass-green, emerald-green
Luminescence: Not fluorescent
Solubility: Soluble in acids with effervescence
Environments
Voglite is a secondary mineral formed from the
alteration of uraninite.
Localities
At the type locality, the Elias Mine, Jáchymov, Karlovy Vary District, Karlovy Vary Region, Czech Republic,
voglite has been described as rhomboidal scales constituting thin coatings and also as scaly twins of
emerald-green to grass-green colour, with a green streak and pearly lustre, associated with
liebigite, uranium ores,
fluorite, dolomite,
clay, and disintegrated
schist.
A second type of voglite forms very thin flat crystals, up to 0.5 mm in size, with furrows in one direction.
The crystals are perfectly transparent, extremely brittle and bright bluish green in colour with a vitreous lustre.
Associates include small balls of cuprosklodowskite,
liebigite, rösslerite,
brassite, zellerite and
uraninite
(Journal of the Czech Geological Society 42.4.54-56).
Voglite from Jáchymov - Image
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