Malachite with Azurite

specimen number:
8282406

location:
Concepcion del Oro, Zacatecas, Mexico

description:

Light green botryoidal crystallized malachite covering most of all sides of this matrix with brilliant blue crystalline azurite. In very good condition.

The Concepcion del Oro mining district, located in the mountainous northern region of Zacatecas, Mexico, is a major historical polymetallic district celebrated for its copper, gold, silver, lead, and zinc deposits. Geologically, the area is characterized by a thick sequence of folded Upper Jurassic to Cretaceous sedimentary rocks, including the Zuloaga, Cupido, and Caracol formations, which were intruded during the Eocene and Oligocene epochs by granodioritic to dioritic stocks. These magmatic pulses induced extensive contact metamorphism, creating complex skarn-replacement ore bodies, mantos, chimneys, and high-grade hydrothermal vein networks rich in chalcopyrite, bornite, galena, and sphalerite. Spanish explorers first discovered the rich surface outcrops and initiated primitive silver and copper mining operations in 1587. Large-scale underground and open-pit industrial exploitation expanded heavily in the late nineteenth and twentieth centuries under various international and domestic mining enterprises, with active exploration, specimen recovery, and modern corporate base-metal extraction continuing continuously into the twenty-first century.

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