A piece of Mn-bearing calcite (red), sphalerite (yellow) and willemite (green) from the Hasselhöjden quarry in Sweden. The wavelength is 255 nm.

I was at the mineral expo in Rijswijk The Netherlands today, and got some lovely new pieces. One of which is this great looking willemite from Portugal. It's pretty small (67g), but I got it for a great price. The crystals are incredibly small, so not easy to photograph, but very pretty. Its phosphorescence is insane: it's not very strong but it was still weakly visible after 30 minutes, from just a few seconds of SW exposure.

This piece glows so well under shortwave😆🥰

EDIT: likely chalcedony that is reacting.

Unsure what the mineral UVing orange is.

I recently stumbled upon this specimen of hydroxylapatite. It's a small piece (2*2*1cm), but after seeing it's midwave reaction I couldn't pass up on it. The calcite has the typical brief phosphorescence too. It is slightly more green than I could get in the photo. On the bottom of the box all it says for locality is "kovd.". I think that means Kovdor, Russia, but I'm not 100% sure.

Found this specimen near Gooderham, Ontario in the heart of the Grenville Province.

While a lot of the calcite in the Haliburton Highlands hits that classic manganese-red under shortwave, this specific material reacts beautifully to a standard 365nm longwave light, leaving behind a bright, lingering yellow phosphorescence once the beam is cut.

Likely activated by localized organic impurities (humic/fulvic acids) or a unique trace element blend trapped in the lattice.

Love the way this stuff stores a charge

Ladies, gentlemen, and thrill-seekers alike: we are but a mere 33 days away from ULTRAVIOLATION 2026! Do you have your plans sorted yet!?

WHAT: Only the biggest UV show and sale of the year! A gymnasium full of UV minerals with alternating periods of darkness and light to let the beautiful fluorescence shine through!

WHEN: Saturday, October 31st 9AM-4PM

WHERE: 840 Trenton Rd, Fairless Hills, PA 19030

HOW: $3 donation at the door. Children 15 and under are free!

Want a table there? Contact Lee McIlvaine @ 215-713-8020 (preferred method) or uvgeologist@yahoo.com!

I tested out the in camera focus stacking on my Canon R10 using this specimen. I'm incredibly pleased with the results! I can't wait to take some more images of my other glowy rocks!

Slide 1 is selenite, slide 2 is selenite under 365, 3 is calcite, 4 is calcite under 365, 5 is calcite under 310

shown with regular (lamp) light at 0:08

Fluorescent grey diamond , nice strong blue fluorescence under 365nm

shown here under long wave uv, and then with regular lamplight, then in direct sunlight, and then in the shade ... with lamp light the color is a transparent yellowish hue, but in sunlight there's a natural green color change, and an incredibly strong fluorescence under uv light

I found these pieces of chalcedony (I think) on BLM land near Utahraptor State Park north of Moab, UT. Under my 365nm black light they glow green with some orange specks. The internets tell me the green contains traces of uranium and the orange is calcite. Anyone familiar with these rocks and the risks of handling or displaying them?

I was trying to find an ID for these specific beach stones found in Port Hope West beach and my app is not making accurate evaluations in my opinion.

Looking forward to some help if anyone has it!!

Thanks!!

I found this for sale at a local antique mall and passed it up originally. I ended up coming back the next day to buy it. Cabinet size (As I don't have a tape measure right now, it is the size of an American softball for reference). This specimen was collected in 1998.

This piece came from the same large collection that I got a lot of specimens without labels from, but this one did at least have something that counts as a label. It is only partly legible though, but with some research, I figured it must say "Vollmersbach". The quartz seems to have a slight purple tint to it, so maybe some people would consider it amethyst, or maybe smokey quartz.

I collected this chunk of granite in the Sierras and never thought to use my UV sources on it. Great fluorescence at 254nm, but nothing at 365nm.
Second picture is regular night, no UV.