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In chemistry the term chromite has been used in two contexts. Under IUPAC naming conventions, chromate(III) is preferred to chromite. [citation needed] For compounds containing an oxyanion of chromium in oxidation state of +3; For other compounds of chromium(III) as a means of distinguishing a chemical species such as hexacyanochromite(III).
Chromite contains Mg, ferrous iron [Fe(II)], Al and trace amounts of Ti. [5] Chromite can change into different minerals based on the amounts of each element in the mineral. Chromite is a part of the spinel group, which means that it is able to form a complete solid solution series with other members in the
Chromitite with bronzite phenocrysts from Stillwater Igneous Complex. Chromitite is an igneous cumulate rock composed mostly of the mineral chromite.It is found in layered intrusions such as the Bushveld Igneous Complex in South Africa, the Stillwater igneous complex in Montana and the Ring of Fire discovery in Ontario.
Nichromite (Ni,Co,Fe)(Cr,Fe,Al) 2 O 4 [1] is a black cubic metallic mineral and member of the spinel group. [5] Nichromite was originally reported from the Bon Accord nickel deposit in Barberton District, South Africa. [1]
Download QR code; Print/export Download as PDF; Printable version; ... Iron(II) chromite is an inorganic compound with the chemical formula FeCr 2 O 4. Preparation
The primary chromium ore is the mixed metal oxide chromite, FeCr 2 O 4, found as brittle metallic black crystals or granules. Chromite ore is heated with a mixture of calcium carbonate and sodium carbonate in the presence of air. The chromium is oxidized to the hexavalent form, while the iron forms iron(III) oxide, Fe 2 O 3:
Copper chromite is produced through the exposure of copper ammonium chromate to temperatures of 350-450 °C: Cu(NH 4) 2 (CrO 4) 2 → CrCuO 3 + CrO + 4 H 2 O + N 2. An active copper chromite catalyst which includes barium in its structure can be prepared from a solution containing barium nitrate, copper(II) nitrate, and ammonium chromate. When ...
Zincochromite is a zinc chromium oxide mineral with the formula ZnCr 2 O 4.It is the zinc analogue of chromite, hence the name.It was first described in 1987 as an occurrence in a uranium deposit near Lake Onega, Russia. [4]