Niningerite is a magnesium-iron-manganese sulfide mineral with the chemical formula MgS that is found in enstatite chondrite meteorites. Niningerite is the magnesium-dominant analog of keilite. This mineral is named after Harvey H. Nininger. See also Glossary of meteoritics References Galena group Magnesium minerals Iron minerals Meteorite minerals Cubic minerals Minerals in space group 225