The hematite, hematite or oligisto is a mineral composed of iron oxide (Fe2O3) and is an important iron ore because in its pure state contains 70% of this metal. Its color silver gray metallic luster submetálico. It looks like tiny mirrors, hence its name "mirror" (a mineral of sedimentary origin). It can occur in broadleaf or tabular habit, or as anhedral crystals. [1]. This is in a reddish color, in addition to the characteristic that stains the skin when touched. Are observed in other minerals contained within the earthy hematite, if they are white, transparent crystals are probably zinc ores such as calamine and hemimorphite or smithsonite, which are zinc carbonates could identify the attack with HCl. By attacking an earthy hematite sample with HCl, we observed that the hematite is slightly soluble in acid, giving a yellow coloration. hematite has a red stripe color, and becomes strongly magnetic when heated in the reducing flame. .
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