Titanium Dioxide Uranium doped
TiO2:U
Chemical name
Titanium Dioxide Uranium doped
Chemical formula
TiO2:U
Melting point [°C]
ca. 1843
Crystal system
tetragonal
Crystal Class
ditetragonal-dipyramidal (4/m 2/m 2/m)
Space Group
I4_1/amd
Unit cell
a [Å]:3.74
b [Å]:3.74
c [Å]:9.39
Molecular weight [g/mol]
79,86
Formula units
Z=4
Frequent crystal surfaces
often prismatic with {110} and {010}
Twinning
rare on {112}
Mohs hardness
5.5 - 6
Density [g/cm3]
ca. 3.9
Cleavage
perfect on {001} and {011}
Fracture / Tenacity
brittle to weakly conchoidal
Color
black, reddish to yellowish brown, dark blue, gray
Streak
pale yellowish to white
Transparency
transparent to opaque
Luster
metallic to adamantine
Optical character
uniaxial (-)
Refractive Index
nω=2.561; nε=2.488
Birefringence δ
0.073
Pleochroism δ
weak
