Hematite is opaque and is a common mineral, iron oxide (Fe2 3). It's luster can be metallic, sub-metallic, dull, and earthy. It's steel-grey to black in crystals and massively crystalline ores, dull to bright "rust-red" in earthy, compact, fine-grained material. It dates back to the Mesozoic Period. When Hematite is streak tested they are all is a rust-red.
Named in 1535-45; < Latin haematites bloodstone < Greek haimati´tes (lithós) blood-like (stone).
Hematite is also known as Black Diamond, Anhydroferrite, Haematite, Hematitogelite, Hematogelite (of Tucan), Iron Glance, Red Hematite, Red Iron Ore, Red Oxide of Iron, Ruddle and Sanguine.
**The 'hematite' used in jewelry, often magnetized, is an artificially created material.