Formula: (Ba,Pb)(UO2)2V2O8 . 5H2O
Origin of name: After locality; Franceville, Haute-Ogooué, Gabon
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 10.41 Ǻ, b = 8.51 Ǻ, c = 16.76 Ǻ
Colour: Yellow, yellowish green to brownish yellow
Diaphaneity:
Luster: Adamantine to pearly
Habit: Crystals, platy, small, impregnations, cryptocrystalline veinlets
Hardness: 3
Specific gravity: 4.55
Cleavage: 1; {001} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments: Series with curienite
| Back to Alphabetical list | Colour photos | Thin sections | SEM images | TEM images | vibrational spectra description | IR spectra | Raman spectra | N-IR spectra | F-IR spectra | IES spectra |