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.
relief well. relief well. A well that drains a pervious stratum, to relieve waterlogging at the surface. A directional well which is drilled to intersect a well that is blowing out, and down which heavy drilling fluid is pumped to kill the blow-out well.