Coffinite, Carnotite: Guadalcanal; Long Park No. 6, Montrose County, Colorado, USA

Species: Coffinite, Carnotite

Locality: Guadalcanal; Long Park No. 6, Montrose County, Colorado, USA
Dimensions:  6 cm x 4.5 cm x 4 cm

Black coffinite (according to the label it was XRD confirmed) in sandstone with secondary yellow carnotite. Eric Quinter specimen U/Th 1077, pictured on mindat.org.