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A polished Cold Mountain Thunderegg specimen pair featuring brecciated jasper in khaki, pink, and brown hues from orange to brick red, with a large fracture filled with translucent chalcedony and opening to a small vug.
Polished faces: 6.9cm x 5.7cm and 6.7cm x 6.2cm
Approx. 1" & 1.5" deep
8.9oz 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.