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Thorite: ThSiO4
Comments: Several small, black cubic crystals of thorite. Location: Balangoda, Ratnapura, Sabaragamuwa province, Sri Lanka. Scale: Picture size 0.8 cm. © Paul M. Schumacher
Comments: Brown crude crystal of thorite var. uranothorite with still visible termination on both ends. Mildly radioactive. Location: Kemp Uranium Mine, Cheddar, Cardiff Township, Haliburton Co., Ontario, Canada. Scale: 15x14x13 mm. © John Betts - Fine Minerals