Description
Species: Uraninite var. Pitchblende, Hematite
Locality: Schwartzwalder mine, Golden, Jefferson County, Colorado USA
Size: 8.2 x 4.7 x 4.6 cm. (~254 grams)
Ex. Jack Nieburger Collection
Nice rich example of pitchblende uraninite ore with hematite and minor pyrite, cut on one face, from the famous Schwartzwalder mine, Golden, Jefferson County, Colorado USA. Measures around 90,000 CPM on my Ludlum Model 3 Counter with the 44-9 probe. Rare!