Guilleminite specimens for sale
1 for sale · $400 USD
7 in the gallery
Guilleminite is a radioactive mineral belonging to the selenite-tellurite-sulfite family. It crystallizes in the orthorhombic system and typically forms tabular, transparent to translucent crystals with a yellow to green coloration and a lustrous surface. Its composition includes uranyl groups, giving it its distinctive chemistry and a relatively high density for a silicate oxide mineral. Specimens are prized for their crisp crystal faces and the way light plays across the tabular forms, often highlighting subtle color zoning.
- Formula
- Ba(UO2)3(SeO3)2O2·3(H2O)
- Classification notes
- Selenites - Tellurites - Sulfites
Key characteristics
- Crystal system
- orthorhombic
- Specific gravity
- 4.88
- Transparency
- transparent, translucent
- Color
- yellow, green
- Cleavage
- perfect
- Crystal habit
- tabular
- Radioactive
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Where Guilleminite is found
Top localities
- Musonoi Mine1 specimen
About Guilleminite
Notable occurrences are associated with uranium-rich environments, with Congo (DR Congo) contributing a significant share of well-documented samples. Collectors value guilleminite for its rarity and scientific interest, as well as the visual appeal of its slender, plate-like crystals that can form in clusters. Handling considerations are important due to its radioactive nature, so specimens are typically collected and cured with appropriate safety practices. Overall, guilleminite appeals to mineral enthusiasts who appreciate complex oxide chemistry, museum-worthy habit, and the challenge of acquiring established, well-formed crystals from notable localities.