Magnetite has been important in understanding the conditions under which rocks form. Magnetite reacts with oxygen to produce hematite, and the mineral pair forms a buffer that can control oxygen fugacity. Commonly, igneous rocks contain solid solutions of both titanomagnetite and hemoilmenite or titanohematite.
Definition of relief well. : a vertical drain used for the drainage of a deep pervious stratum to relieve waterlogging of the surface soil.
When a well experiences a blowout, which is a sudden and uncontrolled expulsion of natural gas or crude oil, relief wells are one way to regain control. The relief well is typically drilled so it will intersect with the blowout, either to relieve pressure or block the reservoir.