“Shown here is a half nodule of agate and quartz, with calcite as a center fill, fluorescing under shortwave UV. The white agate bands fluoresce green, due to uranyl inclusions, and the calcite fluoresces red. The agate fluoresces weakly, but the specimen is still pretty interesting in my humble opinion, since the Mont Lyall agate mine is not known as a fluorescent minerals locale. The calcite is very bright (about 75-80% as bright as Franklin, New-Jersey calcite). Self-collected. ”

“Same specimen, shown in visible light. ”