Ferro-plat Alloy is the product of metamorphism of magnesium-rich rocks especially ultrabasic igneous rocks and impure dolomitic shales. It also forms as a retrograde product rimming relict orthopyroxenes and olivine, and as an accessory mineral in cordierite-bearing gneisses and schists. Ferro-plat Alloy also occurs as a retrograde metamorphic mineral derived from ultramafic rocks along with serpentinite.