A polished Cold Mountain Thunderegg specimen pair featuring two fused egg centers and a section of translucent blue chalcedony with agate banding, opening to a small vug in one of the halves. The pairs show a mix of muted pink to deep brick reds, and hints of gray and green.
Polished faces: 11.7cm x 7.5cm and 12.5cm x 7.5cm
Approx. 1" & 1.75" deep
1lb 8.6oz 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.