It came to the museum after the fair closed and earned its name because changes in humidity in the exhibit hall (before it was climate-controlled) caused parts of the ore to vibrate and "sing," according to AMNH. Finnin/Copyright AMNH) (opens in new tab)Īnother massive slab is the so-called Singing Stone, a nearly 5-ton pillar of blue azurite and green malachite ore that was exhibited at the 1893 World’s Fair in Chicago. The amethyst geode pictured here stands 9 feet (3 meters) tall, weighs around 12,000 pounds (5,440 kilograms), or about as much as four black rhinos, and was collected from the Bolsa Mine in Uruguay.
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