A polished Cold Mountain Thunderegg specimen pair featuring brecciated jasper patterning, a stripe of clear chalcedony, and blotches of color in muted pink to brick red, with hints of blue or sandy yellow. Each half of the pair matches in size and has a full back.
Polished faces: 8.4cm x 5.8cm and 8.2cm x 5.8cm
Approx. 1" - 1.5" deep
13.6oz together
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 of brecciation that has also been filled with silica, so this material takes an exceptional polish, making it ideal for both cabochons and specimens.