Mineralogy Database

Rankamaite Mineral Data

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General Rankamaite Information

Help on Chemical Formula: Chemical Formula: (Na,K,Pb,Li)3(Ta,Nb,Al)11(O,OH)30
Help on Composition: Composition: Molecular Weight = 2,177.26 gm
   Potassium   1.44 %  K     1.73 % K2O
   Sodium      1.80 %  Na    2.42 % Na2O
   Lithium     0.06 %  Li    0.14 % Li2O
   Tantalum   57.34 %  Ta   70.02 % Ta2O5
   Niobium    12.80 %  Nb   18.31 % Nb2O5
   Aluminum    1.49 %  Al    2.81 % Al2O3
   Hydrogen    0.17 %  H     1.53 % H2O
   Lead        2.85 %  Pb    3.08 % PbO
   Oxygen     22.05 %  O
             ______        ______ 
             100.00 %      100.04 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na1.7K0.8Pb0.3Li0.2Ta6.9Nb3Al1.2O26.3(OH)3.7
Help on Environment: Environment: In alluvial concentrates. Probably derived from the alteration of simpsonite in a lithium pegmatite.
Help on IMA Status: IMA Status: Approved IMA 1969
Help on Locality: Locality: Mumba, Kivu, Zaire. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Kalervo Rankama (1913-), Finnish geochemist, University of Helsinki.
Help on Name Pronunciation: Name Pronunciation: Rankamaite + Pronunciation Say RANKAMAITE