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- Chromite is an oxide mineral composed of chromium, iron, and oxygen (FeCr 2 O 4). It is dark gray to black in color with a metallic to submetallic luster and a high specific gravity.
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Chromite is a crystalline mineral composed primarily of iron (II) oxide and chromium (III) oxide compounds. It can be represented by the chemical formula of FeCr 2 O 4. It is an oxide mineral belonging to the spinel group.
Sodium chromate is the inorganic compound with the formula Na 2 CrO 4. It exists as a yellow hygroscopic solid, which can form tetra-, hexa-, and decahydrates. It is an intermediate in the extraction of chromium from its ores.
Chromite is an oxide mineral composed of chromium, iron, and oxygen (FeCr 2 O 4). It is dark gray to black in color with a metallic to submetallic luster and a high specific gravity.
Chromate containing minerals are rare. Crocoite, PbCrO 4, which can occur as spectacular long red crystals, is the most commonly found chromate mineral. Rare potassium chromate minerals and related compounds are found in the Atacama desert. Among them is lópezite – the only known dichromate mineral.
Name: Chromite was named in 1845 by Wilhelm Haidinger in allusion to its composition. The species was originally named fer chromate alumine by Louis Nicolas Vauquelin in 1798. Vauquelin was the discoverer of the element chromium. Type Locality: ⓘ Carrade de Cavalaire, Cavalaire-sur-Mer, Draguignan, Var, Provence-Alpes-Côte d'Azur, France.
1821. Berthier and Faraday discover chromium’s alloying properties and produce the first chrome-alloyed steel. 1830. Norway begins to mine chromite. 1846. Small chromite deposits discovered in Canada. 1848. Important chromite discovery in Turkey. 1849. Chromite discovered in lndia (but is only exploited 50 years later). 1858.
ore. chromite series. chromite, relatively hard, metallic, black oxide mineral of chromium and iron (FeCr 2 O 4) that is the chief commercial source of chromium. It is the principal member of the spinel series of chromium oxides; the other naturally occurring member is magnesiochromite, oxide of magnesium and chromium (MgCr 2 O 4 ).
