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Brief Description: Its name derives from the Greek word rodochrus (rosy) because of its colour. Its chemical formula is MnCO3 and it belongs to the category Carbonate Minerals. It has vitreous or pearly lustre. Its colour ranges in various shades of rosy (from light rosy to deep red). It might also be ashy-yellow or brown. Transparent or semitransparent. Its specific gravity is 3.5 - 3.7, hardness 3½ - 4 and fusibility 7. The crystals are rare rhombohedral with triangular crystal system. It is usually found in schistose masses, granular, spheroid, botryose aggregations. It effervesces with hot hydrochloric acid. It occurs in sedimentary deposits in hydrothermal veins with galenite, sphalerite, iron pyrite, calcite and quartz, as well as in transformed deposits with granate, rhodonite, and other manganese minerals. 
Bibliography: Ευρετήριο ορυκτών ΑΠΘ στην ιστοσελίδα http://www.geo.auth.gr/106/az_gr.htm Τσιραμπίδης Α. (2005). Ο ορυκτός πλούτος της Ελλάδας. Εκδόσεις Γιαχούδη Θεσσαλονίκη, 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.