Chemical composition of studied actinolites and hornblendes makes (wt %): FeO 4.31-14.43, Fe2O3 0.31-3.84; MgO 8.82-21.71, A12O3 0.56-12.23, CaO 10.58-12.29; Na2O 0.25-1.88, K2O 0.04-1.14. As a result of investigation of ...