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Rhodochrosite is a manganese carbonate mineral with chemical composition MnCO3. In its (rare) pure form, it is typically a rose-red color, but impure specimens can be shades of pink to pale brown. It streaks white, and its Mohs hardness varies between 3.5 and 4. Its specific gravity is between 3.5 and 3.7.
Hyponyms (each of the following is a kind of iron ore): goethite; gothite (a red or yellow or brown mineral; an oxide of iron that is a common constituent of rust) chamosite (a greenish grey or black silicate of iron and aluminum) taconite (a variety of chert containing magnetite and hematite; mined as a low-grade iron ore) haematite; hematite (the principal form of iron ore; consists of ferric oxide in crystalline form; occurs in a red earthy form) lepidocrocite (a red to reddish brown mineral consisting of iron oxide hydroxide; often found in iron ores together with goethite) limonite (a widely occurring iron oxide ore; a mixture of goethite and hematite and lepidocrocite) magnetic iron-ore; magnetite (an oxide of iron that is strongly attracted by magnets)