- Silicon and iron isotope compositions were analyzed in various components of enstatite chondrites (EC) to understand isotopic fractionation during planet formation.<br> - Metal–sulfide nodules in EC showed significant enrichment in light silicon isotopes.<br> - Silicon isotopic values in different fractions of EC varied, becoming progressively heavier with increasing Mg#.<br> - White mineral phases, primarily SiO2 polymorphs, exhibited the heaviest silicon isotopic values.<br> - Metal–silicate partitioning played a crucial role in determining the silicon isotopic composition of EC.<br> - The overall lighter silicon isotopic composition of bulk EC compared to other planetary materials was attributed to the enrichment of light silicon isotopes in EC metals and loss of heavier silicates.<br> - Iron isotope composition (δ56Fe) in EC components varied, with metals enriched in heavy isotopes and sulfides in light isotopes.<br> - Combined silicon and iron isotope data showed an inverse correlation, indicating significant fractionation under reduced conditions.<br> - Silicon isotopic compositions of silicate fractions largely retained information from nebular processing, while iron isotopes might have undergone re-equilibration during metamorphism.<br> - Uniform δ56Fe among different chondrites and Earth suggests common origin and fractionation processes in nebular reservoirs during planet formation.