General Information:
Chemical Formula:
Ca(UO2)2SiO3(OH)2·5(H2O)
Composition:
(Molecular Weight = 586.36 gm)
Calcium 6.84 % Ca
Uranium 40.59 % U
Silicon 9.58 % Si
Hydrogen 2.06 % H
Oxygen 40.93 % O
Empirical Formula:
CaH2(SiO4)2(UO2)·5(H2O)
Environment:
Alteration procduct of gummite.
Locality:
Oberpfalz, Bavaria.
Name Origin:
From uran and phanos - "to appear."
Physical Properties:
Cleavage:
[100] Perfect
Color:
yellow, yellow brown, yellow green, yellow orange, or light yellow.
Density:
3.9
Diaphaniety:
Translucent to subtranslucent
Habits:
Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite), Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite)., Mass ive - Fibrous - Distinctly fibrous fine-
Hardness:
2.5 - Finger Nail
Luminescence:
None.
Luster:
Vitreous (Glassy)
Streak:
yellowish white
More details...