Uraninite var. Pitchblende, ‘Gummite”: Monument Valley District, Navajo County, Arizona, USA

Description

Species: Uraninite var. Pitchblende, ‘Gummite”

Locality: Monument Valley District, Navajo County, Arizona, USA

Dimensions: 6.1 x 4.7 x 4.0 cm, 160 grams

Ex. Mark Wilson Collection

Very neat specimen in which a petrified wood limb has been completely replaced by high-grade uranium mineralization. A core of dense solid uraninite is surrounded by colorful secondary uranium minerals. Measures an impressive 160,000+ CPM on my Ludlum Model 3 Counter with the 44-9 probe. Rare!