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A polished Cold Mountain Thunderegg specimen pair featuring a mix of translucent blue-gray chalcedony and brecciated jasper in shades of brown to pink, and hints of khaki green.
Polished faces: 12.6cm x 5.2cm and 12.9cm x 5cm
Approx. 1" & 1.5" deep
13.5oz 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.