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hematite, heavy and relatively hard oxide mineral, ferric oxide (Fe2O3), that constitutes the most important iron ore because of its high iron content (70 percent) and its abundance. Its name is derived from the Greek word for “blood,” in allusion to its red colour.
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Hematite
Hematite, also spelled as haematite, is a common iron oxide compound with the formula, Fe₂O₃ and is widely found in rocks and soils. Hematite crystals belong to the rhombohedral lattice system which is designated the alpha polymorph of Fe
₂O
₃. It... Wikipedia
Birefringence: δ = 0.280
Cleavage: None, may show partings on, and
Crystal system: Trigonal
Density: 5.3
Diaphaneity: Opaque
Fracture: Uneven to subconchoidal
Luster: Metallic to splendent