Francevillite
A variety of Francevillite Group
What is Francevillite?
Francevillite is a uranyl-group vanadate mineral in the tyuyamunite series. Its chemical formula is (Ba,Pb)(UO2)2V2O8·5(H2O). Francevillite is a strongly radioactive mineral. It is typically orange, yellow or brownish yellow. It forms a series with curienite.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Francevillite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Francevillite Localities Map
See where Francevillite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Key Characteristics
Formation of Francevillite
Francevillite occurs in the oxidized zone of a lead-bearing uranium–vanadium deposits. Francevillite was first described in 1957 for an occurrence in its type locality of the idle Mounana uranium mine, near Franceville, Haut-Ogooué, Gabon and was named for the city. At its type locality it is associated with curienite (a closely related uranyl vanadate), chervetite (a lead vanadate), and mounanaite (another lead vanadate). At other localities, francevillite is associated with duttonite, vanuralite, mottramite, carnotite, dewindtite, torbernite, uranopilite, johannite and kasolite.
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Quick Facts
Physical Properties
- Hardness (Mohs)
- 3
Chemical Properties
- Chemical Formula
- Ba(UO2)2(VO4)2 · 5H2O
- Elements
- Ba, H, O, U, V
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Francevillite FAQs
How do I identify Francevillite?
Francevillite can be identified by its hardness of 3 on the Mohs scale. Look for these key characteristics when examining specimens.
How hard is Francevillite?
Francevillite has a hardness of 3 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
What is the formation of francevillite of Francevillite?
Francevillite occurs in the oxidized zone of a lead-bearing uranium–vanadium deposits. Francevillite was first described in 1957 for an occurrence in its type locality of the idle Mounana uranium mine, near Franceville, Haut-Ogooué, Gabon and was named for the city. At its type locality it is associated with curienite (a closely related uranyl vanadate), chervetite (a lead vanadate), and mounanaite (another lead vanadate). At other localities, francevillite is associated with duttonite, vanuralite, mottramite, carnotite, dewindtite, torbernite, uranopilite, johannite and kasolite.