Mineral Chemistry and The Stability Temperature of Nickel-Iron Sulfide from Kolaka Ultramafic Rocks, Southeast Sulawesi Rio Irhan Mais Cendra Jaya, Syahrul Syahrul, Masri Masri OPHIOLITE : Jurnal Geologi Terapan Vol. 7 No. 1 2025 DOI 10.56099/ophi.v7i1.p1-6