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Named for the Greek word aimatodes, meaning “bloodlike,” in reference to the mineral’s color and streak. Hematite is extremely common with thousands of localities with exceptional crystals from Switzerland, Romania, Italy, England, Norway, Brazil, South Africa, Algeria, and the United States. Hematite occurs as an accessory mineral in igneous rocks, as a sublimate in volcanic rocks, in high-temperature hydrothermal veins, a contact metamorphism product, in metamorphosed banded iron formations, as a cement in sedimentary and a constituent in oolitic iron formations, and it is abundant on weathered iron-bearing minerals.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/hematite.pdf