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Help on Chemical Formula: Chemical Formula: Na2(Mg,Fe++)3(Al,Fe+++)2Si8O22(OH)2
Help on Composition: Composition: Molecular Weight = 795.32 gm
   Sodium      5.78 %  Na    7.79 % Na2O
   Magnesium   6.11 %  Mg   10.14 % MgO
   Aluminum    2.54 %  Al    4.81 % Al2O3
   Iron        8.78 %  Fe    9.03 % FeO /  2.51 % Fe2O3
   Silicon    28.25 %  Si   60.44 % SiO2
   Hydrogen    0.25 %  H     2.27 % H2O
   Oxygen     48.28 %  O
             ______        ______ 
             100.00 %       96.98 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na2Mg2Fe2+Al0.75Fe3+0.25(Si8O22)(OH)2
Help on Environment: Environment: High pressure, low temperature metamorphic mineral. Discredited by IMA amphibole subcommittee (now glaucophane or ferroglaucophane or magnesioriebeckite or riebeckite).
Help on IMA Status: IMA Status: Discredited IMA 1997 - Valid Species (Pre-IMA) 1894
Help on Locality: Locality: Berkeley, Conta Costa Co., USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named in 1894 for Charles Whitman Cross, (1854-1949), geologist, United States Geological Survey.
Help on Synonym: Synonym: Discredited
  ICSD 27459
  PDF 20-376