Fluorescent rocks are fun to experiment on. You can buy them from a wide variety of places. This UV Tools UV Fluorescent Mineral Kit comes with everything beginners need to get started. It has 5 types of minerals and a 4-watt UV light with shortwave and long wave mode.
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UV Tools UV Fluorescent Mineral Kit (SW/LW) -- Gadgetify
This kit comes with Willemite, Chalcedony, Fluorite, Calcite, and Sphalerite rocks.
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