2.8" Goethite (Limonite) Pseudomorph after Pyrite/Marcasite - Egypt

This is a 2.8" wide limonite pseudomorph after pyrite/marcasite.

This specimen was collected from the White Desert, near Farafra Oasis, Egypt. These mineral aggregates, known by many as "Prophecy Stones", have been collected for years from the Cretaceous-aged Khoman Chalk of the White Desert. Studies have been conducted to verify this mineral's composition, but the specific age of formation is unknown. While they are collected from a Cretaceous deposit, studies suggest that they formed post deposition.
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DETAILS
SPECIES
Goethite (Limonite)
LOCATION
White Desert, Near Farafra Oasis, Egypt
FORMATION
Khoman Chalk
SIZE
2.8" wide
CATEGORY
ITEM
#180751