Hematite: Iron Oxide (Fe₂O₃) crystallizing in the Trigonal System as rhombohedral, short, flattened, and sometimes lamellar crystals; metallic gray, black, or reddish in color; density 4.95–5.26 g/cm³; Mohs hardness 5–6.5.

Hematite: Iron Oxide (Fe₂O₃) crystallizing in the Trigonal System as rhombohedral, short, flattened, and sometimes lamellar crystals; metallic gray, black, or reddish in color; density 4.95–5.26 g/cm³; Mohs hardness 5–6.5.
