A rare mineral containing uranium and other elements, named after the person who discovered it.
Named after Johan H. L. Cappelen, a Norwegian mineralogist and geologist, with the mineral suffix -ite added to create the standard mineralogical naming convention.
Cappelenite is so rare that only a handful of specimens exist worldwide, and it was found in Norway where it formed under unusual geological conditions that haven't been fully replicated anywhere else!
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