CMT152 Cold Mountain Thunderegg Specimen From Mexico A mottled white

A mottled white

and does take a nice shine

Tiny dark brown speckles of dendrites are visible going back into one of the layers

Each slab is unique and can have varying patterns of banding

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CMT152 Cold Mountain Thunderegg Specimen From Mexico A mottled whiteThis polished specimen displays tan, yellow, reddish brown, and blue gray, with four different sections of chalcedony with swirly banding. 5" x 3. 25" x 1. 5" 11 oz 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