Delafossite is a copper iron oxide mineral with formula CuFeO2 or Cu1+Fe3+O2. It is member of the delafossite mineral group with a general formula ABO2, a group characterized by a sheet of linearly coordinated A cations stacked between edge-shared octahedral layers (BO6). Delafossite along with other minerals of the ABO2 group has been recognized ...
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http://en.wikipedia.org/wiki/Delafossite
metallic, black copper and iron oxide (CuFeO2) that is found as a secondary mineral associated with other oxide minerals of copper and iron in ...
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http://www.britannica.com/eb/a-z/d/26
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