Uraninite with Chalcocite in Sandstone and very well formed bright yellow, cauliflower formations of Uranopilite. Crystallized Gypsum needles in between the UV reactive secondaries. Dense, High-Grade Ore from one of the most historic Uranium Mines in the country. This piece is large and exceptionally hot. Beautiful under magnification. 
19x11.2x4.75
954 grams
700,000 cpm on Radiacode 103
About 1.2 Million CPM on Radiacode 110!