David K. Joyce

Quartz, var. Chalcedony, Opal

4.6x3.7x3.5 cm
Black Hills Area
Safford, Graham County
Arizona, USA

Quartz, var. Chalcedony, OpalQuartz, var. Chalcedony, Opal

Item number: 29734

This one is actually a big botryoid of chalcedony-opal formed on top of a spray of larger quartz crystals. The best feature though is the bright green fluorescence under SW u-v light.