General Information:
Chemical Formula:(U,Ca)2(Ta,Nb)2O6(OH)
Composition:(Molecular Weight = 695.81 gm)Calcium 6.91 %
CaUranium 27.37 %
U Tantalum 46.81 %
TaNiobium 2.67 %
NbHydrogen 0.14 %
H Oxygen 16.10 %
O Empirical Formula: U0.8Ca1.2Ta1.8Nb0.2O6(OH)
IMA Status:Approved IMA
Locality:Fazenda Posse, Brejauba district, Municiop de Conceicao de Serro, Minas Gerias, Brazil.
Name Origin:Named for uranium and as a member of the microlite group.
Physical Properties: Cleavage:None
Color:greenish brown, yellow brown, or black.
Density:5.75 - 5.88, Average = 5.81
Diaphaniety:Transparent to Opaque
Habits:Octahedral Crystals - Occurs as octahedral shaped crystals., ,
Hardness:5.5 - Knife Blade
Luminescence:Highly Radioactive.
Luster:Greasy (Oily)
Streak:yellow
More details...
