抄録
The coexistence of manganoan actinolite and tirodite in samples from four manganese ore deposits has been investigated by an electron probe microanalysis and an X-ray powder method. These amphiboles occur with spessartine, rhodonite, rhodcchrosite and/or alabandite, pyrophanite, quartz. Al2O3, TiO2, Na2O, and K2O contents of these amphiboles are very small. Analytical data are plotted on a quadrilateral, Ca2Mg5Si8O22(OH)2-Ca2 (Fe, Mn)5Si8O22(OH)2-Mn2Mg5Si8O22(OH)2-Mn2(Fe, Mn)5Si8O22(OH)2. X-ray powder patterns of the amphiboles are also given.
