Uranophane - Madawaska (Faraday) Mine, Faraday Township, Hastings County, Ontario, Canada

Ca(UO₂)₂(SiO₃OH)₂ · 5H₂O

Uranophane is a vibrant yellow, radioactive uranium silicate mineral often found in the oxidized zones of uranium-rich deposits. At the Faraday Mine near Bancroft, Ontario, uranophane occurs as delicate acicular (needle-like) crystals, often forming striking radiating sprays or fibrous masses. These specimens are typically found within fractures and cavities of pegmatitic rocks, where uranium-bearing fluids interacted with silicate minerals during late-stage hydrothermal processes. The mineral’s vivid coloration and association with rare-earth minerals make it a hallmark of Bancroft’s rich geological heritage.

The Faraday Mine, a historic site known for its uranium production in the mid-20th century, has become a celebrated locality for mineral collectors. Uranophane specimens from this mine are prized for their brilliant color, well-defined crystal habit, and association with other rare minerals. Beyond their aesthetic appeal, these specimens provide a glimpse into the dynamic processes of uranium mineralization and alteration. Today, Faraday Mine stands as a key reference point in the study of uranium deposits, exemplifying the interplay of mineralogical, geochemical, and hydrothermal factors in the formation of secondary uranium minerals like uranophane.

 This area is now closed down and rehabilitated, so no new specimens will be coming out of here.

Approx. specimen size: 50mm x 40mm x 20mm

Approx. specimen activity on an SE International Ranger EXP: 8800 cpm