Minerals contained in Erciyes rocks include clinopyroxene, ilmenite, orthopyroxene, plagioclase, and titanomagnetite. Samples taken from the summit also contain amphibole, apatite, biotite, feldspar, quartz, and zircon. The mineral Yazganite was first described from samples obtained on Mount Erciyes, and its chemical formula is NaFe23·H2O.