Chalcosiderite (Maskelyne, 1875; Schaller, 1912) is related to turquois by isomorphous substitution of A1 by Fe. The structure of turquois was recently determined by the author (Cid-Dresdner, 1965), and a determination of the structure of chalcosiderite was considered desirable. Chalcosiderite crystals from West Phoenix, England, were kindly provided by Professor Clifford Frondel of Harvard University for this investigation.

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