General Information:
Chemical Formula:
(U,Ca,Ce)(Ti,Fe)2O6
Composition:
(Molecular Weight = 354.80 gm)
Calcium 3.39 % Ca
Cerium 7.90 % Ce
Uranium 33.54 % U
Titanium 20.24 % Ti
Iron 7.87 % Fe
Oxygen 27.06 % O
Empirical Formula:
U0.5Ca0.3Ce0.2Ti1.5Fe2+0.5O6
Environment:
Found in gold palcers.
IMA Status:
Approved IMA 1963
Locality:
Kelly Gulch, Custer County, Idaho. Stanley Basin, Wyoming. USA.
Name Origin:
Named after the American geologist, G. Branner (1850-1922).
Physical Properties:
Cleavage:
None
Color:
brown, brown green, yellow, yellow brown, or black.
Density:
4.5 - 6.35, Average = 5.42
Diaphaniety:
Subtranslucent to opaque
Habits:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Crystalline - Fine - Occurs as well-formed fine sized crystals., Metamict - Mineral originally crystalline, now amo rphous due to radiation damage.
Hardness:
4-5 - Fluorite-Apatite
Luminescence:
Highly Radioactive.
Luster:
Adamantine - Resinous
Streak:
dark greenish brown
More details...