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Ferripedrizite, ideally  A Na B Li 2  C (Fe 3+  2 Mg 2 Li)TSi 8 O 22  X (OH) 2 , is a new amphibole end-member found in episyenites formed after cordierite-bearing porphyritic granites in the Eastern Pedriza Massif (Central System, Spain). It contains the maximum amount of Li that can be incorporated in the amphibole structure. The name was approved by the IMA-CNMMN together with restriction of the use of the prefix sodic in the pedrizite series to compositions with  B Na &gt; 0.5 apfu; its use for compositions with Na tot  &gt; 0.5 apfu has been maintained in the rest of the Mg-Fe-Mn-Li group. Complete solid solution between ferripedrizite and leakeite [ideally,  A Na B Na 2  C (Fe 3+  2 Mg 2 Li) T Si 8 O 22  X (OH) 2 ] has been found in the Pedriza Massif. According to the present nomenclature rules, this join bridges three different amphibole groups. Samples with  B (Mg+Fe+Mn+Li) ≥ 1.0 apfu and 0. 0 £  B Na £ 0.50 apfu belong to the Mg-Fe-Mn-Li group and are termed ferripedrizite; samples with  B (Mg + Fe + Mn + Li) ≥1.0 apfu and 0.50 &lt;  B Na £ 0.99 apfu belong to the Mg-Fe-Mn-Li group and are called sodicferripedrizite; samples with  B (Mg + Fe + Mn + Li) &lt; 1.0 apfu and  B Na ≥ 1.50 apfu belong to the sodic group and are named leakeite; samples with  B (Mg+Fe+Mn+Li) &lt; 1.0 apfu and 1.0 £  B Na &lt; 1.50 apfu belong to the sodic-calcic group (albeit Ca is negligible) and deserve a new root name.

american mineralogist

Ferripedrizite, a new monoclinic  B Li amphibole end-member from the Eastern Pedriza Massif, Sierra de Guadarrama, Spain, and a restatement of the nomenclature of Mg-Fe-Mn-Li amphiboles