Silikon ƙarfe, wanda kuma aka sani da silicon crystalline ko silicon masana'antu, galibi ana amfani dashi azaman ƙari ga gami da ba na ƙarfe ba.Silikon ƙarfe samfuri ne da aka narke daga quartz da coke a cikin tanderun lantarki.Babban abun ciki na silicon shine kusan 98% (a cikin 'yan shekarun nan, 99.99% na abun ciki na Si shima yana cikin silicon karfe), sauran ƙazanta sune ƙarfe da aluminum., calcium, da sauransu.