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Melanocerite-(Ce): (Ce,Th,Ca)5(Si,B)3O12(OH,F)·n(H2O) (?)
Comments: Black, vitreous, crystalline aggregates of melanocerite-(Ce) in matrix. Location: Cardiff Uranium mine, Wilberforce, Monmouth Township, Haliburton Co., Ontario, Canada. Scale: See Image. © Paul M. Schumacher