A top-quality specimen of SPHALERITE (an important volcanogenic ore of Zinc) with variable trace element content of Cadmium, Gallium, Germanium and Indium. Dimensions: 12 x 10 x 5 cm, weight: 560 g. Origin: This specimen was collected during a joint visit of North London Polytechnic (Geology Dept) and the Mineralogical Society of Greece to the Ancient Mines of Lavrion, Attica, Greece during the early 80s.

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