Uraninite, Calcite
Shinarump Nos. 1 - 3 Mines, Seven Mile Canyon Mining District, Grand County, Utah, USA
Uraninite determination by visual appearance and radioactivity. 332K CPM by Ludlum 44-9 probe (a,b,g) and Bicron Labtech Analyzer in scaler mode. Dark material is the uraninite in sandstone, with light colored calcite and brown sandstone.