RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY
Cassiterite crystals. Crystals of cassiterite (SnO2), a tin oxide mineral, in their host rock. Cassiterite has been the main tin ore throughout history and is still the most important source of tin today.
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