Learn about Galena
metallic luster with cube and cuboctahedral crystals, often twinned; sharp cleavage reveals reflective planes, a standout sulfide for collectors.Tsumeb
Tsumeb, Namibia — world-renowned locality famed for a rich copper–lead–zinc ore pipe, with dioptase on calcite, azurite blades, and smithsonite prized by colle…
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