- Fluorite (Fluorescent) and Siderite
- Small Cabinet, 6.5 x 5.0 x 3.5 cm
- Boltsburn Mine, Weardale, County Durham, England
- Ex. Herb Obodda
Classic pair of interpenetrating twins of Fluorite from the world-renowned Weardale District. The largest of these gemmy, grey-blue crystals is 5 cm, and the fluorescence is world-class. Hence the origin of the word 'fluorescence' based on fluorite from this mining district!