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Brief Description: Its name derives from the Greek word haema (blood) due to the colour of its powder. Its chemical formula is Fe2O3 and it belongs to the category Oxides. Its lustre is metallic (in crystals) semi-metallic or dull. Its colour is steel-ashy (in crystals) or brown-red to black. Its hardness ranges from 5½ - 6½ and its specific gravity from 4.9 to 5.3. It is semitransparent or opaque and its fusibility is 7. Crystal system: triangular. It occurs in tabular or leafy crystals. It is also found in aggregates, solid, radial, botryose, reniform, earthen (red ochre), as well as in rosettes. Sometimes with surface iridescent colours. It is the most common ferrous mineral of sediments and transformed sediments. It occurs together with magnetite, limonite, goethite, siderite, ilmenite, chalcedony etc. It is one of the most important iron ores. 
Bibliography: Ευρετήριο ορυκτών ΑΠΘ στην ιστοσελίδα http://www.geo.auth.gr/106/az_gr.htm Τσιραμπίδης Α. Ο ορυκτός πλούτος της Ελλάδας. Εκδόσεις Γιαχούδη Θεσσαλονίκη, 2005, σελ. 391. Berry, L.G., Mason, B. and Dietrich, R.V. (1983). Mineralogy. W. H. Freeman and Company, San Francisco, 561 pp. Σαπουντζής, Η. και Χριστοφίδης, Γ. (1985). Ορυκτοδιαγνωστική. University Studio Press, Θεσσαλονίκη, 241 σ.