Mineralogy Database

Arnhemite Mineral Data

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General Arnhemite Information

Help on Chemical  Formula: Chemical Formula: (K,Na)2Mg2(P2O7)•5(H2O)
Help on Composition: Composition: Molecular Weight = 620.94 gm
   Potassium   17.50 %  K    21.09 % K2O
   Sodium       3.37 %  Na    4.54 % Na2O
   Calcium      0.97 %  Ca    1.35 % CaO
   Magnesium    6.89 %  Mg   11.42 % MgO
   Manganese    0.18 %  Mn    0.23 % MnO
   Zinc         0.11 %  Zn    0.13 % ZnO
   Iron         0.27 %  Fe    0.35 % FeO
   Phosphorus  20.10 %  P    46.06 % P2O5
   Hydrogen     1.66 %  H    14.83 % H2O
   Oxygen      48.96 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K2.78Na0.91Mg1.76Ca0.15Fe2+0.03Mn2+0.02Zn0.01P4.03O13.89�5.11(H2O)
Help on Environment: Environment: Occurs as flakes that form aggregates making up the principal component of a thin layer of white, friable slag in the profile of cave-floor soil.
Help on IMA Status: IMA Status: Not Approved IMA
Help on Locality: Locality: Arnhem Cave, Namibia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after it's locality.