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A polished Cold Mountain Thunderegg specimen pair featuring brecciated jasper in deep, muted magenta to brick red, with brown and blue-gray accents and thin areas of fractures filled with chalcedony.
Polished faces: 7.2cm x 6.2cm and 7.4cm x 6.7cm
Approx. 1. 25" - 1.5" deep
13.1oz 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.