CMT157 Cold Mountain Thunderegg Specimen Aquamarine This polished slab features golden

This polished slab features golden yellow and cream

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

2" diameter

This Pyrite cube in Marl Matrix is from Navajún

From Kerrouchen

CMT157 Cold Mountain Thunderegg Specimen Aquamarine This polished slab features goldenA 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