Dims: 1" x 3/4" x 3/8"
Wt: 2.3 g
Virgem de Lapa area, Minas Gerais, Brazil
I personally wouldn't be able to tell this specimen apart from the nearest autunite, but I haven't seen many uranium minerals before working on this site. The crystals are, of course, bright yellow, tabular, and surprisingly opaque for their thinness. The piece seems to be made up almost entirely of the mineral, though there are some suspiciously botryoidal, black formations that remind me of goethite. The uranocircite crystals are quite small, measuring just over 1/16 inch in diameter. I love the colors of uranium minerals like this; the yellow simply looks too bright to be a natural occurrence!