Formation
(1) Magmatic, through fractional crystallization and gravitational separation as an accessory or cumulate in mafic to ultramafic intrusions (e.g., gabbro, anorthosite). (2) Metamorphic, through the transformation of titanium-bearing minerals under amphibolite to eclogite facies conditions. (3) Sedimentary, through mechanical enrichment as a chemically and physically resistant heavy mineral in placer deposits.
