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Formula: Pb1-xO3-2x(UO2)4(OH)4+2x.4H2O
Oxide containing uranium
Specific gravity: 6.046
Hardness: 3 to 4
Streak: Orange
Colour: Red, golden-red, brown
RADIOACTIVE
Environments
Pegmatites
Sedimentary environments
Hydrothermal environments
Fourmarierite is a rare secondary mineral formed as an alteration product of
uraninite in the oxide zone of uranium deposits; it may replace fossil wood. Associated minerals
include uraninite, ianthinite,
schoepite, becquerelite,
billietite, dewindtite,
phosphuranylite, vandendriesscheite,
rutherfordine, torbernite,
kasolite, curite and
goethite
(HOM).
Localities
At Great Bear Lake, Northwest Territories, Canada, fourmarierite occurs on altered uraninite
(Dana).
At the type locality, the Shinkolobwe mine, Shinkolobwe, Kambove District, Haut-Katanga, DR Congo, fourmarierite occurs with
kasolite, torbernite and other
secondary uranium minerals
(Dana).
At the Monument No. 2 mine, Monument No. 2 channel, Yazzie Mesa, Cane Valley Mining District, Apache County, Arizona, USA,
fourmarierite occurs in oxidised, mineralised fossil wood
(Dana).
At Spruce Pine, Mitchell Co., North Carolina, USA, fourmarierite occurs as an alteration of
uraninite in pegmatites
(Dana).
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