"Mineral known as the imperial gem" NYT crossword answer is:
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The imperial gem is a rare and valuable mineral that is highly sought after by collectors and gem enthusiasts. It is a deep purple-blue color and is often used in jewelry and other decorative items. It is found in a few locations around the world, but is most commonly found in the Ural Mountains of Russia. It is often referred to as the "king of gems" due to its rarity and beauty.