Abstract
To ascertain the origin of manganese minerals, ?? studied minor components contained in manganese minerals from South-Western Hokkaido, Japan. and the following results were obtained. Al, Si, Fe, Mg, Ti, Ca, V, Ce, Na, K and Cu etc. were detected ?? n all specimens of manganese minerals, irrespectively of their types of deposit or their occurrences. Among those elements, Sn, In, Ni, Co and Cr etc. are contained in manganese minerals, which occurred in metasornatic replacement deposits in Palaeozoics. Ag, As and Ba were detected in minerals deposited in the Neogene Tertiary. But Ni, Co and Cr etc. were determined a little or none in manganese minerals in Tertiary deposits and Ag, As and Ba were never contained in minerals being formed in Palaeozoics.
Discrepancy of contained minor elements in manganese minerals may be due to the condition of crystallization of those minerals.
