General Information:
Chemical Formula:
Ca(UO2)4(SO4)2(OH)6·6(H2O)
Composition:
(Molecular Weight = 1,522.45 gm)
Calcium 2.63 % Ca
Uranium 62.54 % U
Hydrogen 1.19 % H
Sulfur 4.21 % S
Oxygen 29.43 % O
Empirical Formula:
Ca(UO2)4(SO4)2(OH)6·6(H2O)
Environment:
Associated with gypsum and other secondary uranium minerals as an alteration product of pitchblende.
IMA Status:
Approved IMA
Locality:
Rabejac and Mas d'Alary village a few kilometers from Lodeve, France.
Name Origin:
Named for the locality.
Physical Properties:
Cleavage:
None
Color:
yellow or amber yellow.
Density:
4.1
Diaphaniety:
Transparent to Translucent
Habits:
Acicular - Occurs as needle-like crystals., Nodular - Tuberose forms having irregular protuberances over the surface., Aggregates - Made of numerous individual crystals or clusters.
Hardness:
3 - Calcite
Luminescence:
Fluorescent, Short UV=light yellow, Long UV=light yellow.
Luster:
Vitreous (Glassy)
Streak:
white
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