CMT157 Cold Mountain Thunderegg Specimen Aquamarine This Pyrite cube in Marl

This Pyrite cube in Marl Matrix is from Navajún

and mounted on a base of Coral and Black Onyx

This is a polished specimen featuring foggy blue and red coloring with white bands

visible cell structure in silver on an 18" Italian silver chain

CMT157 Cold Mountain Thunderegg Specimen Aquamarine This Pyrite cube in MarlA polished specimen featuring reddish brown, dusty peach tan, and translucent, blue gray chalcedony filling the thunderegg fracture pattern. 3" x 4. 5" x 2. 25" 1 lb 1. 1 oz Cold Mountain Thundereggs are from the Sierra Mountains in Mexico. The thundereggs can contain water banding and feature red, mauve, or black webbing. While technically a rhyolite due to its thunderegg nature, Cold Mountain Thundereggs are highly silicate and feature large amounts