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Chromite can also be presented in a thin section. The grains seen in thin sections are disseminated with crystals that are euhedral to subhedral. [12] 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.
It is most commonly known to be the main host matrix for diamonds. It is named after the town of Kimberley in South Africa , where the discovery of an 83.5- carat (16.70 g) diamond called the Star of South Africa in 1869 spawned a diamond rush and led to the excavation of the open-pit mine called the Big Hole .
The most common mineral inclusion in peridot is the chromium-rich mineral chromite. Magnesium-rich minerals also can exist in the form of pyrope and magnesiochromite. These two types of mineral inclusions are typically surrounded "lily-pad" cleavages. Biotite flakes appear flat, brown, translucent, and tabular. [16]
Altered samples of the Blue Ridge Ophiolite are green, with white and black crystals that are visible. In thin section some samples have no olivine such as the sample form Todd, North Carolina. Altered minerals that can be seen in thin section are chlorite and chromite. [3] Sample of Talc-Actinolite Schist taken from Todd, North Carolina ...
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Chromite, a FeCr 2 O 4 containing mineral It is used as a commercial source of chromium and its compounds. [ 1 ] It is also used as a catalyst in the synthesis of hydrogen (H 2 ) from the reaction between carbon monoxide and water vapor.
It is derived from the mineral chromite, (Fe,Mg)Cr 2 O 4. The conversion of chromite to chromia proceeds via Na 2 Cr 2 O 7, which is reduced with sulfur at high temperatures: [7] Na 2 Cr 2 O 7 + S → Na 2 SO 4 + Cr 2 O 3. The oxide is also formed by the decomposition of chromium salts such as chromium nitrate, or by the exothermic ...
George Wilken, 79, rode out the fire in Pacific Palisades, racing from spot fire to spot fire in his SUV with water and watching hopefully as firefighting planes dropped water to douse the flames.