A purple, semi-precious gemstone will enjoy a moment in the spotlight this weekend at the Sudbury Gem and Mineral Show. Amethyst will glitter at the Sudbury Gem and Mineral Show starting Friday night ...

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In a recent article in Miner Deposita, researchers presented a comprehensive study of the amethyst and agate geodes in the Los Catalanes Gemmological District of Northern Uruguay. This region is ...