Yellow zincite strongly fluorescent under longwave 365nm, with willemite and calcite. The blue fluorescence is strongly phosphorescent. 1st pic LW, 2nd SW, last white light. The gallery at the end shows closeup pics of the sphalerite, var cleiophane. Franklin's Cleiophane tends to be small dots whereas SHMM's is more patchy. The blue is Cleiophane, the pink and orange (when present) is the Sphalerite.