Coffinite: Fair Day mine, Jamestown, Boulder County, Colorado, USA

Species: Coffinite

Locality: Fair Day mine, Jamestown, Boulder County, Colorado, USA

Dimensions: 4.2 x 3.4 x 1.6 cm, 44 grams

40K CPM

Ex. Hal Miller Collection

Rich specimen of black Coffinite from the Fair Day mine, Jamestown, Boulder County, Colorado, USA. Measures ~40,000 CPM on my Ludlum Model 3 Counter with the 44-9 “pancake” probe. Rare!