Zircon var. Cyrtolite: Butterfield pegmatites, South Platte Pegmatite Mining District, Jefferson County, Colorado, USA

Description

Species: Zircon var. Cyrtolite

Locality: Butterfield pegmatites, South Platte Pegmatite Mining District, Jefferson County, Colorado, USA

Dimensions: 8.9 x 5.8 x 2.6 cm.

Ex. Bob Werner Collection

Excellent specimen of well-formed brownish crystals of Zircon var. Cyrtolite from the Butterfield pegmatites, South Platte Pegmatite Mining District, Jefferson County, Colorado, USA. Measures ~75,000 CPM on my Ludlum Model 3 Counter with the 44-9 probe due to high Thorium content. Rare!