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In the crust the free metal is rare, occurring as terrestrial iron (alloyed with 2â3 percent nickel) in basaltic rocks in Greenland and carbonaceous sediments in the United States (Missouri) and as a low-nickel meteoric iron (5â7 percent nickel), kamacite.
Naturally occurring iron contains 5.82% of 54^(Fe)26 {the 54 is SUPERSCRIPTED and the 26 is SUBSCRIPTED) , 91.66% of 56^(Fe)26 , 2.19% of 57^(Fe)26 and o.33% of 58^(Fe)26. The respective atomic masses are 53.940 amu, 55.935 amu, 56.935 amu, and 57.933 amu.