Geothite Psuedo Pyrite from Gachala, Colombia (610.6 grams)

This substantial specimen from Gachala, Cundinamarca, Colombia, features an iron cross twin of goethite pseudomorph after pyrite. The pyrite is completely concealed beneath a thin goethite layer, resulting in a distinctive black-brown surface appearance.

Weight: 610.6 grams, Dimensions: 2.5 x 2.5 x 2 inches