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Hematite is an important ore of iron and its blood red color (in the powdered form) lends itself well to use as a pigment. Hematite gets its name from a Greek word meaning blood-like because of the color of its powder. Ancient superstition held that large deposits of hematite formed from battles that were fought and the subsequent blood that flowed into the ground. Crystals of Hematite are considered rare and are sought after by collectors as are fine Kidney Ore specimens.
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HEMATITE Chemical Formula: Fe2O3, Iron Oxide Class: Oxides and Hydroxides Group: Hematite Uses: Very important ore of iron, as a pigment and as mineral specimens. Physical caracteristics : •Color is steel or silver gray to black in some forms and red to brown in earthy forms. Sometimes tarnished with iridescent colors when in a hydrated form (called Turgite). •Luster is metallic or dull in earthy and oolitic forms. •Transparency: Crystals are opaque. •Crystal System is trigonal; bar 3 2/m •Crystal Habits include tabular crystals of varying thickness sometimes twinned, micaceous (specular), botryoidal and massive. also earthy or oolitic. •Cleavage is absent. However, there is a parting on two planes. •Fracture is uneven. •Hardness is 5-6 •Specific Gravity is 5.3 (slightly above average for metallic minerals) •Streak is blood red to brownish red for earthy forms. •Best Field Indicators are crystal habit, streak and hardness.
Very important ore of iron, as a pigment and as mineral specimens.
Limonite is an iron ore consisting of a mixture of hydrated iron(III) oxide-hydroxides in varying composition. The generic formula is frequently written as FeO(OH)·nH2O, although this is not entirely accurate as the ratio of oxide to hydroxide can vary quite widely.
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