Uranophane (Lambertite) - Lusk, Wyoming, USA

Ca(UO₂)₂(SiO₃OH)₂ · 5H₂O

Uranophane, also known as Lambertite, is a notable mineral, particularly for its uranium content and its striking yellow to greenish-yellow coloration. Here is an overview of Uranophane, specifically as it pertains to its occurrence in Lusk, Wyoming, USA:

General Information

• Chemical Formula: $Ca(U{O}_2{)}_2(Si{O}_{3}OH{)}_2\cdot 5H_{2}O$
• Mineral Class: Silicate (Phyllosilicate)
• Crystal System: Monoclinic
• Color: Bright yellow, greenish-yellow
• Luster: Vitreous to silky
• Transparency: Transparent to translucent

Occurrence in Lusk, Wyoming

• Location: Lusk, Wyoming, has been a historically significant area for uranium mining in the United States, particularly during the mid-20th century.
• Geology: Uranophane is typically found in oxidized zones of uranium-rich deposits. In Lusk, these deposits are associated with sedimentary rocks, including sandstone and conglomerates.
• Formation: Uranophane forms through the alteration of uranium-bearing minerals such as uraninite in the presence of silica and calcium.

Properties

• Radioactivity: Uranophane is radioactive due to its uranium content, requiring careful handling and storage.
• Habit: Often occurs as fibrous or needle-like aggregates, crusts, or coatings on other minerals.
• Associated Minerals: Often found with autunite, torbernite, uraninite, and other secondary uranium minerals.

Significance

1. Scientific: Uranophane is studied for its role in uranium ore formation and the geochemical processes involved in uranium mobility and deposition.
2. Economic: As a secondary uranium mineral, it has limited but historical significance in uranium extraction and mining.
3. Collector's Value: Its vibrant color and fibrous texture make it a desirable specimen for mineral collectors.

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Approx. specimen size: 65mm x 50mm x 20mm

Approx. specimen activity on an SE International Ranger EXP: 37 000 cpm