Uranocircite: Assuncao mine, Viseu, Portugal

Description

Species: Uranocircite, Microcline

Locality: Assuncao mine, Aldeia Nova, Viseu, Portugal

Dimensions: 9 x 6 x 3 cm. (200 grams)

Ex. David P. Wilber collection.

A very nice cabinet-size specimen of brilliant green uranocircite crystals from the major discovery at the Assuncao pegmatite in Portugal around 15 years ago. Brilliant green fluorescence under U.V. light. Good crystal coverage and condition. Measures ~125,000 CPM on my Ludlum Model 3 counter with the 44-9 probe.