Uraninite var. Pitchblende: Radium Vein, 1040 Level, Caribou Mine, Caribou Mine group, Grand Island, Caribou Mining District, Boulder County, Colorado, USA

Species: Uraninite var. Pitchblende

Locality: Radium Vein, 1040 Level, Caribou Mine, Caribou Mine group, Grand Island, Caribou Mining District, Boulder County, Colorado, USA

Dimensions: 4.3 x 3.2 x 1.8 cm.

Ex. Hal Miller Collection

Rich specimen of Uraninite var. Pitchblende from the Radium Vein, 1040 Level, Caribou Mine, Caribou Mine group, Grand Island, Caribou Mining District, Boulder County, Colorado, USA. Uraninite specimens from this classic and historic Colorado locality are very hard to come by, especially with this level of documentation. Likely mined in the early 20th century. Measures 40,000 CPM on my Ludlum Model 3 Counter with the 44-9 probe. Rare!