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1.9" Goethite Pseudomorph after Pyrite - Egypt
This is a 1.9" wide goethite pseudomorph after pyrite and likely marcasite as well. This specimen was collected from the White Desert near Farafra Oasis, Egypt. These mineral aggregates have been collected for years from the Cretaceous age Khoman Chalk of the White Desert. Studies have been done to verify this mineral's composition, however the specific age of formation is unknown. While they're collected from a Cretaceous deposit, studies suggest that they formed post deposition.
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.
SPECIES
Goethite
AGE
LOCATION
White Desert, Near Farafra Oasis, Egypt
FORMATION
Khoman Chalk
SIZE
1.9" wide
CATEGORY
ITEM
#168537
