AskDefine | Define chromite

Dictionary Definition

chromite n : a brownish-black mineral; the major source of chromium

User Contributed Dictionary

English

Noun

  1. A dark brown mineral that is a mixed oxide of iron, magnesium and chromium; it is a commercial source of chromium

Translations

mineral

Extensive Definition

Chromite, iron magnesium chromium oxide: (Fe, Mg)Cr2O4, is an oxide mineral belonging to the spinel group. Magnesium is always present in variable amounts, also aluminium and iron substitute for chromium.
Chromite is found in peridotite and other layered ultramafic intrusive rocks and also found in metamorphic rocks such as serpentinites. Ore deposits of chromite form as early magmatic differentiates. It is commonly associated with olivine, magnetite, serpentine, and corundum. The vast Bushveld igneous complex of South Africa is a large layered mafic to ultramafic igneous body with some layers consisting of 90% chromite making the rare rock type, chromitite.
Chromite is also used as a refractory material.
The only ore of chromium is the mineral chromite. In the western hemisphere, chromite ore is produced only in Brazil and Cuba; By comparison, about 80% of world production of chromite comes from India, Iran, Pakistan, Oman, Zimbabwe, Turkey and Southern Africa. Southern Africa itself produces about half of this.
Chromite is mined from the ultramafic rocks in the Zhob District of Balochistan. Most of the chromite is of metallurgical grade with Cr2O3 averaging 46% and a chrome to iron ratio of 3:1.

References

chromite in Czech: Chromit
chromite in German: Chromit
chromite in Spanish: Cromita
chromite in Esperanto: Kromito
chromite in French: Chromite
chromite in Italian: Cromite
chromite in Hebrew: כרומיט
chromite in Lithuanian: Chromitas
chromite in Hungarian: Kromit
chromite in Dutch: Chromiet
chromite in Japanese: クロム鉄鉱
chromite in Low German: Chromit
chromite in Polish: Chromit
chromite in Portuguese: Cromita
chromite in Finnish: Kromiitti
chromite in Swedish: Kromit
chromite in Ukrainian: Хроміт
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