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goethite (FeO(OH)

Remarks

       Goethite has had a reputation for making rather uninteresting, dull and "dirty" mineral specimens. This is definitely not true of many of the fine specimens available to collectors today. Some good pieces show splendid radiating clusters of deep black crystals. Massive stalactitic forms show rainbows of irridescent colors on surreal landscapes. Many times Goethite forms the backdrop or matrix for other minerals such as red Vanadinite, making a visually appealing mineral specimen.

Other names (trademark, branding etc.)

Goethite

Product Specification

GOETHITE   Chemical Formula:  FeO(OH), Hydrated Iron Oxide Class:  Oxides and Hydroxides Group:  Goethite Uses:            Physical  caracteristics :       •Color is  yellow, brown, brownish red to black. Sometimes tarnished with irridescent colors.     •Luster is  earthy to dull for massive forms and metallic for crystals.     •Transparency crystals are  opaque.     •Crystal System is  orthorhombic; 2/m 2/m 2/m     •Crystal Habits include prismatic and platy crystals, massive and aggregate forms include internally radiating or fibrous;  reniform, botryoidal and stalactitic.     •Cleavage is  perfect in one direction.     •Fracture is  uneven to splintery.     •Hardness is  5-5.5     •Specific Gravity is  variable at 3.3 to 4.3 (light for metallic minerals)     •Streak is  brown, brownish yellow to orange yellow.     •Best Field Indicators are  crystal habit, streak and tarnish.     

Application

Very important ore of iron, as a pigment and as mineral specimens.

Raw Material

Goethite (FeO(OH)), (/ˈɡɜrtaɪt/ gur-tite) named after the German polymath Johann Wolfgang von Goethe (1749–1832), is an iron bearing oxide mineral found in soil and other low-temperature environments. Goethite has been well known since prehistoric times for its use as a pigment. Evidence has been found of its use in paint pigment samples taken from the caves of Lascaux in France.

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