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A stone of rapid transformation
Geode colors depend on the agate layer inside the rock and the type of crystals that form on the agate layer
Gemologists believe that Tanzanite mining will be depleted within the next 10-20 years
The Yaogangxian Pluton
Lining the brittle matrix is a mix of botryoidal Chalcedony and minute purple Fluorite clusters
Uruguay Amethyst Heart AM1303 Red A stone of rapid transformationLocality: Cataln Grande, Artigas Department, Uruguay Dimension: Weight: 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 cavities that were first
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