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Cassiterite crystals on quartz. The crystals, lustrous and with perfectly defined faces and edges, clearly show the peak tin twinning. The specimen measures ±7.5 x 5.5 cm and is mounted on a 5 x 5 cm methacrylate base. The largest cassiterite crystal measures ±22mm in diameter.
Viloco Mine, Araca, La Paz, Bolivia