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