Our forensic technician, Mohit Mistry, gave up some time on the DerbyUni Video Spectro Comparator to look at some minerals from @derbyuniearth.bsky.social collection. Fluorite/Beryl/Topaz/Opal/Selenite/Opal in transmittedUV 365nm; violet 410nm; floodUV 365nm; white light.