Enstatite chondrites (or E chondrites) represent only 1.0% of all falls. They have the highest free metal and sulfide content (23-35% by weight) and the lowest oxidation state of all chondrites. Their silicate phase is almost purely enstatite (MgSiO3), an iron-free form of pyroxene. A distinction is sometimes made between EH and EL chondrites on the basis of their free metal and sulfide contents (H for high, L for low). Quite distinctively, all the iron in E chondrites is visible as free metal. Alteration grades for E chondrites range from 3 to 6. Most E chondrites are of the E6 petrologic type.
E chondrites are of the E6 petrologic type.