Goethite

Goethite is a popular mineral composed of iron oxide hydroxide. ^[1]

Goethite: Quick Facts and Characteristics

Some quick facts for Goethite:

• Transparency: Goethite is opaque.
• Crystallography: In terms of crystallography, goethite is orthorhombic.
• Luster: In terms of luster, goethite can be dull, silky or submetallic.
• Streak: Goethite streaks brownish-yellow, brownish-yellow yellow or yellow.
• Specific Gravity: Goethite's specific gravity ranges from 3.3 to 4.3.

Goethite: Background and Summary

Goethite is a common iron oxide mineral that is found in various geological settings around the world. It is named after the German mineralogist Johann Wolfgang von Goethe, who first described the mineral in 1806. Goethite is often found as a weathering product of other iron minerals, such as pyrite, magnetite, and siderite. It is also formed in soils and sediments, where it can occur as an important component of mineral assemblages.

Goethite is typically brown to reddish-brown in color, but can also appear yellow, orange, or black. It has a hardness of 5-5.5 on the Mohs scale, and a density of 3.3-4.3 g/cm3. Goethite can be identified by its characteristic crystal habit, which is typically acicular or fibrous. It can also be distinguished from other iron oxides by its lack of magnetism, as goethite is not magnetic.

Goethite has a wide range of uses in various industries. One of its most important applications is as a pigment in paints, coatings, and ceramics. Its brownish-red color is highly valued for its natural appearance and ability to provide a warm, earthy tone. Goethite is also used as an iron ore in the production of steel, as well as in the manufacture of other iron-based products such as pigments, cement, and fertilizers.