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forming at 157 to 170 million years ago
Forming some of the most interesting
Huge dogtooth Calcite with Baryte association and a penetrator Sphalerite from the famous Elmwood Mine
some specimens exhibit intense modification on the surface
Uruguay Amethyst Mixed Shapes AM1144 - Mega Dogtooth Calcite Smoky Quartz forming at 157 to 170Locality: Cataln Grande, Artigas Department, Uruguay Dimension: 26. 4x14. 9x12. 0 cm Weight: 3961g About 160 million years ago, when tectonic plates were rifting Africa and South America apart as the Atlantic Ocean opened, one of the worlds great flood basalt events was occurring. Basalts flowed from the rift, producing stratified lava flows thousands of feet thick in Brazil and nearby Uruguay. Within these flows, gas bubbles and lava tubes created
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