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These elements are grouped as austenite-forming, ferrite-forming, carbide-forming and nitride-forming elements. Austenite-forming elements The elements C, Ni and Mn are the most important ones in this group. Sufficiently large amounts of Ni or Mn render a steel austenitic even at room temperature.
The Earth's mantle may have significant olivine. In meteorites, olivine is important in some pallasites. The olivines are a solid solution series with forsterite containing the most magnesium and fayalite having the most iron.The olivine in most stony iron meteorites ranges in composition from 60 to 85 percent forsterite with the remainder being fayalite.Feldspars --calcium, sodium. aluminum silicates--are the most important rock forming minerals in the crust of the Earth, but are relatively scarce in meteorites.he olivine in most stony iron meteorites ranges in composition from 60 to 85 percent forsterite with the remainder being fayalite. Feldspars --calcium, sodium. aluminum silicates--are the most important rock forming minerals in the crust of the Earth, but are relatively scarce in meteorites.