Abstract
The concentrations of total iron, and of nickel, cobalt, calcium, chromium and manganese have been determined by X-ray fluorescence in fifty-seven chondrites, seven carbonaceous chondrites, three enstatite chondrites, fifteen achondrites and in the silicate phase of two pallasites. The high-iron-group chondrites have an average of 27.36 % iron by wt., and the low-iron group has an average of 21.71 % iron by wt. Their nickel and cobalt contents show comparable differences. Significant differences in the concentrations of calcium and manganese are found between chondrites which belong to the low-iron group and those which belong to the high-iron group. The ratios Ca Mn are quite constant between the groups. The ratios Fe:Ca and Ca:Mn for the carbonaceous chondrites of Type II and Type III differ generally from the Fe:Ca and Ca:Mn ratios for the high-iron chondrites as a group. Among the achondrites examined, the Ca-poor achondrites are much more variable in composition than the Ca-rich achondrites.
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