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spinel
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spinel

Any of a group of ‘mixed oxide’ minerals consisting mainly of the oxides of magnesium and aluminium, MgAl2O4 and FeAl2O4. Spinels crystallize in the cubic system, forming octahedral crystals. They are found in high-temperature igneous and metamorphic rocks. The aluminium oxide spinel contains gem varieties, such as the ruby spinels of Sri Lanka and Myanmar (Burma).
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It is never found in pure state but rather as zinc carbonate, zinc oxide, zinc silicate, as well as in minerals like franklinite and zincite.
Copper is the star as Africa enjoys price boom: the exceptionally ... by Siddiqi, Moin / African Business
It is never found in its refined state but rather as zinc carbonate, zinc oxide or zinc silicate, as well as in minerals like franklinite and zincite.
Prices rise as demand soars: base metals such as copper and steel are ... by Siddiqi, Moin / African Business
 
 
 
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