General Information:
Chemical Formula:
(K,Na)Ca2[Fe++3(Al,Fe+++)2][Si5Al3O22](OH)2
Composition:
(Molecular Weight = 966.86 gm)
Potassium 3.03 % K
Sodium 0.59 % Na
Calcium 8.29 % Ca
Aluminum 9.07 % Al
Iron 21.66 % Fe
Silicon 17.43 % Si
Hydrogen 0.21 % H
Oxygen 39.71 % O
Empirical Formula:
K0.75Na0.25Ca2Fe2+3Al1.25Fe3+0.75(Si6Al2O22)(OH)2
IMA Status:
Proposed IMA (Dana # Added)
Name Origin:
Named for the composition and for Ryoichi Sadanaga (1920-), professor emeritus, University of Tokyo.
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