General Information:
Chemical Formula:
Ca(UO2)3(CO3)4·3(H2O)
Composition:
(Molecular Weight = 1,144.24 gm)
Calcium 3.50 % Ca
Uranium 62.41 % U
Hydrogen 0.53 % H
Carbon 4.20 % C
Oxygen 29.36 % O
Empirical Formula:
CaUO23CO34·3(H2O)
Environment:
Uranium deposit.
IMA Status:
Approved IMA
Locality:
TL: Rabejec deposit (7 km SSE of Lodeve), Herault, France.
Name Origin:
Named for Francois Fontan, mineralogist, University of Paul-Sabatier, Toulouse, France.
Physical Properties:
Cleavage:
[010] Distinct, [001] Distinct, [100] Distinct
Color:
honey yellow.
Density:
4.1
Diaphaniety:
Transparent
Habits:
Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite), Aggregates - Made of numerous individual crystals or clusters.,
Hardness:
3 - Calcite
Luster:
Vitreous (Glassy)
Streak:
white
More details...