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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.
Kromi (nga greq. chroma „ngjyrë“) është një element kimik i cili në sistemin periodik e gjejmë me simbolin Cr dhe radhitet si i 24 me radhë. Lidhshmërinë me kromin e kanë shumë ngjyra dhe shpesh përdoren si pigmente për ngjyrë dhe llak. Histori. Kristal i pastër kromi.
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Chromite is the most important chromium ore mineral. It forms a complete solid solution series with many other members of the group, eg. in the Chromite-Hercynite Series, Chromite-Spinel Series, Chromite-Magnetite Series and the Chromite-Magnesiochromite Series. It is the iron analogue of Zincochromite, Cochromite, Manganochromite and ...
Chromite is the only ore of chromium, a metal essential for making stainless steel, nichrome, chrome plating, pigments, refractories, chemicals and pharmaceuticals.
The Bulqizë mine is a large mine located in central Albania in Dibër County, 40 kilometres (25 mi) east of the capital, Tirana. Bulqizë represents the largest chromium reserve in Albania and one of the largest in Europe, having estimated reserves of 2.82 million tonnes of ore grading 45.83% chromium metal. [1]
Potassium dichromate first used as a tanning mordant and Koechlin introduces chrome yellow in calice printing. Berthier and Faraday discover chromium’s alloying properties and produce the first chrome-alloyed steel. Norway begins to mine chromite. Small chromite deposits discovered in Canada.
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.
