This element forms a red solution when it complexes with thiocyanate, and although it is not aluminum, a chloride of this element catalyzes a Friedel-Crafts alkylation. The oxide of this element is used industrially to produce ammonia in the Haber-Bosch process, and this element exists in a solid solution with carbon in its gamma variety austenite. This element is derived from the ore hematite, and its brass-colored pyrite is commonly known as "fool's gold". For 10 points, name this transition metal with chemical symbol Fe.
