Uranophane, Sklodowskite & Kasolite - Eagle Picker Mine, Niacia, Mexico

Ca(UO₂)₂(SiO₃OH)₂ · 5H₂O       Mg(UO₂)₂(SiO₃OH)₂ · 6H₂O     Pb(UO₂)(SiO₄) · H₂O

The Eagle Picker Mine in Niacia, Mexico, is renowned for its striking specimens of uranophane, sklodowskite, and kasolite—three uranium-rich secondary minerals that form in oxidized zones of uranium deposits. Uranophane, with its bright yellow to greenish-yellow needle-like crystals, is a calcium uranium silicate that forms delicate, fibrous aggregates. Its vivid coloration and silky texture make it a standout mineral, offering a glimpse into the complex geochemical interactions that occur during the weathering of primary uranium minerals. At this locality, uranophane often coexists with other uranium minerals, creating visually striking associations that are highly sought after by collectors.

Sklodowskite and kasolite add further diversity to the mineral assemblage at the Eagle Picker Mine. Sklodowskite, named after physicist Marie Skłodowska-Curie, is a magnesium uranium silicate characterized by its pale yellow to green fibrous crystals, often forming in radiating sprays. Kasolite, a lead uranium silicate, is typically found as earthy to crystalline masses with a warm orange to reddish-brown color. These minerals reflect the rich uranium-bearing environment of the mine and the intricate alteration processes that occur under specific geological conditions. Together, they form a unique mineralogical suite that not only appeals to collectors but also provides valuable insights into uranium geochemistry and secondary mineral formation in arid climates.

Approx. specimen size: 75mm x 40mm x 20mm

Approx. specimen activity on an SE International Ranger EXP: 2000 cpm