Formula: Ca(UO2)3(CO3)4 . 3H2O
Origin of name: For Francois Fontan, French mineralogist
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: Bright yellow
Diaphaneity: Transparent
Luster: Vitreous
Habit: Lath-shaped crystals to 0.05 x 0.15 x 1.2 mm in radiating aggregates
Hardness: 3
Specific gravity: 4.10
Cleavage: 3; {010}, {001} and {100}
Tenacity:
Streak: White
Synonyms/varieties:
Comments: Fluoresces light green under UV light
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