Arsenopyrite

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Light green micro crystals of arthurite fairly rich across the front of this matrix with massive arsenopyrite.The geology of the Majuba Hill mine in Pershing County, Nevada, consists of a complex Tertiary rhyolite intrusive plug and associated breccia masses that cut through older sedimentary rocks, hosting multi-metal mineralization related to a hydrothermal system. Discovered in 1907 with subsequent underground development beginning around 1914, the historic mine experienced intermittent production periods primarily targeting high-grade surface and underground deposits through a series of adits and tunnels. Over the decades, small-scale operations extracted notable quantities of metal ores, while modern exploration continues to evaluate the site as a porphyry system.