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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 |
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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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