This flat presents an extensive selection of Phurcalite, Metamunirite, Zippeite and related uranium bearing secondary minerals from Utah, USA. The specimens are mainly developed in massive to fine grained form and display a characteristic range of yellow, yellow green to greenish coatings and zones that contrast clearly with the predominantly grey to brown host rock. Under UV light, many pieces show strong fluorescence, making this flat particularly illustrative and attractive for collectors. The illustrated flat shows exactly the offered assortment and is offered as a unique flat.
Geology & Origin
The minerals originate from oxidized uranium deposits in Utah, where they formed as secondary products within the weathering zone. Phurcalite, Metamunirite and Zippeite develop through reactions of uranium rich primary minerals with phosphate and sulfate bearing fluids under oxidizing conditions. Localities in Utah are internationally recognized for their diversity of fluorescent uranium minerals and provide important reference material for mineral collections.