This flat presents a varied selection of Phurcalit and Metahewettit crystals from Utah. The specimens mainly show flat, crust-like to fine-grained mineral coatings with characteristic yellow to yellow-green coloration, complemented by contrasting greenish areas. The different rock plates and fragments illustrate the wide range of appearances typical for these secondary uranium minerals. All specimens are individually arranged, forming a carefully composed flat offered as a unique piece.
Geology & origin
Phurcalit and Metahewettit are secondary uranium minerals that form in the oxidized zones of uranium-rich deposits. They develop through the weathering of primary uranium minerals and typically occur as coatings, crusts, or fine-grained aggregates. The specimens shown originate from well-known localities in Utah, USA, a region internationally recognized for its diverse and complex uranium mineral assemblages.