A cavity in rock lined with crystals that have grown inward toward the center.
From German Druse, of uncertain origin, possibly from Middle High German. First used in mineralogy in the 18th century to describe these geometric crystal-lined cavities found in geodes.
Druses are hidden treasures inside rocks—when water carrying dissolved minerals seeps into tiny cracks, it slowly deposits crystals that point inward, creating sparkling crystal-lined caves smaller than your fist.
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