Formed by weathering or low-temperature oxidation of spinels containing ferrous iron, commonly magnetite or titanian magnetite. Widespread yellow pigment in sediments.
IMA Status:
Valid Species (Pre-IMA) 1927
Locality:
Iron mountain mine, 9.5 miles NW of Redding, Shasta Co., California. Link to MinDat.org Location Data.
Name Origin:
From MAGnetite and HEMatite, in allusion to the mineral's magnetism and composition.
Chemical Formula: 