 Zircon is a common accessory to trace mineral constituent of most granite and felsic igneous rocks.Due to its hardness, durability and chemical inertness, zircon persists in sedimentary deposits and is a common constituent of most sands.Zircon is rare within mafic rocks and very rare within ultramafic rocks aside from a group of ultrapotassic intrusive rocks such as kimberlites, carbonatites, and lamprophyre, where zircon can occasionally be found as a trace mineral owing to the unusual magma genesis of these rocks.