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2.8" Goethite/Limonite Pseudomorph after Cubic Pyrite - Morocco
This interesting, 2.8" wide goethite/limonite pseudomorph after pyrite was collected from Morocco. These twinned cubic pyrite aggregations underwent surface alteration to goethite/limonite, giving the exterior of the crystals their dark color.
About Goethite
Goethite is an iron-bearing hydroxide mineral composed primarily of iron(III) oxide-hydroxide (FeO(OH)). It commonly forms as a weathering product of iron-rich minerals and is one of the primary components of rust and limonite. Goethite often develops in botryoidal, stalactitic, or massive forms, though it can also occur as acicular or needle-like crystals. Its color ranges from yellow-brown to reddish-brown or black, with a dull to submetallic luster. This mineral is widespread in soil and sedimentary environments and frequently associated with hematite, magnetite, and quartz. Named after the German poet and philosopher Johann Wolfgang von Goethe, goethite has been used historically as a pigment and remains a significant iron ore in some regions.
Goethite is an iron-bearing hydroxide mineral composed primarily of iron(III) oxide-hydroxide (FeO(OH)). It commonly forms as a weathering product of iron-rich minerals and is one of the primary components of rust and limonite. Goethite often develops in botryoidal, stalactitic, or massive forms, though it can also occur as acicular or needle-like crystals. Its color ranges from yellow-brown to reddish-brown or black, with a dull to submetallic luster. This mineral is widespread in soil and sedimentary environments and frequently associated with hematite, magnetite, and quartz. Named after the German poet and philosopher Johann Wolfgang von Goethe, goethite has been used historically as a pigment and remains a significant iron ore in some regions.
