SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY
Quartz crystal cluster on display in a museum in Namibia. This is the world's largest quartz cluster, it was discovered in 1985 at the bottom of a 45 metre deep cave in the Otjua mine near Karibib in Namibia. It weighs 14,100 kg and took three years to excavate and remove.
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