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A polished Cold Mountain Thunderegg specimen pair featuring a muted golden orange hue with dark reddish brown accents and fracture lines filled with translucent chalcedony.
Polished faces: 8.2cm x 5.6cm and 8.3cm x 5.6cm
Approx. 1" & 1.5" deep
11oz 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.