Fluorescent and Phosphorescent Fluorite from Hamilton, Ontario

Contributed by: FMS Admin
minID: KU5-NVL
Date: May 16th, 2026
Locality: Flamboro Quarry, West Flamborough Township, Hamilton, Ontario, Canada (See on Mindat)
Size: 9.1 x 6.9 x 13.3 cm

Description:
Nice crystals of light yellowish-amber fluorite, lining a vug in dolomitic limestone. From the famous Flamboro Quarry (often misspelled "Flamborough Quarry"), West Flamborough Township, Hamilton, Ontario, Canada.

In the first picture, the specimen is shown fluorescing under longwave UV; then in the next pictures, are shown, respectively: LW phosphorescence, midwave UV fluorescence, MW phosphorescence, shortwave UV fluorescence, SW phosphorescence, blue light (450 nm) fluorescence, green light (532 nm) fluorescence and lastly, the specimen is shown in visible light. This specimen is at its best under longwave but fluoresces nicely under MW and SW too.

Recently acquired in a trade; unfortunately, to this day, I never had a chance to visit this place myself. It is definitely on my bucket list; not only for the nice fluorite found there, but also because small but gorgeous orange sphalerite crystals (non-fluorescent, alas) are also found there, as well as calcite and others.

Originally posted by Frédéric Messier Leroux on Nature's Rainbows in 2021.