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A polished Cold Mountain Thunderegg specimen featuring brecciated jasper in shades of orange to pink with brick red detailing.
Polished face: 7.1cm x 5.8cm
Approx. 1/2" deep
2.7oz
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.