17TL16: A novelty at Tucson 2014. Transparent botryoidal growth, on matrix. This type of Opal (hyalite variety) has the main virtue of fluorescing even in daylight. In fact, it fluoresces under almost all types of light: LED, fluorescent, daylight and, of course, also under ultraviolet light. In fact, the only light they don't react to is incandescent light. The locality is still very generic but we are sure that over time a more precise locality will become known, as well as the reasons for its unusually intense fluorescence.
Zacatecas  Mexico (2013-2014)

Specimen size: 2.9 × 2.6 × 1.2 cm = 1.14” × 1.02” × 0.47”