Mineralogy Database

Rollandite Mineral Data

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General Rollandite Information

Help on Chemical  Formula: Chemical Formula: Cu3(AsO4)2•4(H2O)
Help on Composition: Composition: Molecular Weight = 543.29 gm
   Copper    36.26 %  Cu   45.39 % CuO
   Arsenic   27.58 %  As   42.31 % As2O5
   Hydrogen   1.41 %  H    12.60 % H2O
   Oxygen    34.75 %  O
            ______        ______ 
            100.00 %      100.29 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Cu3.1(AsO4)2•3.8(H2O)
Help on Environment: Environment: Secondary mineral in old Cu mines. New structure-type.
Help on IMA Status: IMA Status: Approved IMA 1998 (Dana # Added)
Help on Locality: Locality: Cu mines of Roua at the western margin of the Barrot Dome, Alpes-Maritimes, France. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Pierre Rolland (1940-), an eminent mineral collector of the Roua mines.
Help on Synonym: Synonym: ICSD 90026