Commonly known as thunder eggs, the geologic word for the name of this species of nodule is lithophysae (Greek for “rock bubbles”). This species of nodule only occurs in rhyolite-perlite lava flows and domes. Lithophysae are spherulites that happened to develop gas cavities wherever the external pressure was low enough to allow dissolved gas to expand a cavity.
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| Weight | 0.0000 kg |
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