Check the listing for details. Fluorescent/Tenebrescent Hackmanite Specimen 20-40 grams. Condition: New. Listed at 26.99 USD. Fluorescent/Tenebrescent Hackmanite Specimen. You will receive one Hackmanite specimen, weighing 20-40 grams. These specimens glow orange under longwave UV (365 nm), and are tenebrescent (reversible photochromism). Exposure to UV will change the color of the hackmanite to purple/dark blue. Exposure to white light will fade the specimen back to its original color. You may choose your specimen, simply message us and we will show you the available options. Otherwise your specimen will be chosen at random. Weight: 20-40 grams Origin: Afghanistan
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