Earth Minerals of Interest
Natural Purple Botryoidal Agate from Indonesia

Cool natural purple Botryoidal agate from Indonesia
Credit: Ical Muh Risal. via: Richard Nass
Source: Amazing Geologist

Lake Superior Thunder Egg

Lake Superior Thunder Egg - A thunder egg is a nodule-like geological structure,
similar to a geode, that is formed within a rhyolitic lava flow. Credit: Captain Tenneal
Source: Amazing Geologist

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Agates and Geodes