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Cuprostibite: Cu2(Sb,Tl) Ussingite: Na2AlSi3O8(OH)
Comments: Massive ussingite hosting grains of the very rare copper antimony-thallium bearing cuprostibite. Location: Ilimaussaq, Tasseq, Greenland. Scale: 4.8 x3.4 cm. © John Veevaert