Lost Mines Of The Olmecs

  DISCOVER  January 2003

100 Top Science Stories Of 2002

  81. Rare Jade Riddle Cracked

The Kunz Axe, a 3,000-year-old Olmec blue-jade sculpture, features a snarling creature that is part human, part jaguar. Courtesy of The American Museum of Natural History, New York.

In 1804 naturalist Alexander von Humboldt returned to France from the Americas with jade artifacts crafted by the Olmecs. This pre-Mayan, pre-Columbian culture had left behind statues and axes made of a translucent blue-green jade found almost nowhere else in the world. Today archaeologists know the Olmecs had stopped using the stone by about 500 B.C. Later cultures favored other shades of jade, and the blue-green version became known as Olmec blue. But the geological source of the jade had never been found. Geophysicist Russell Seitz, field director of a study of Mesoamerican jade for Harvard's Peabody Museum, had spent years looking for the elusive transparent blue-green stone. By 1999, when he took his fiancée to Guatemala for a vacation, he had given up hope of finding the mother lode. Then, by chance, he stumbled upon half a dozen shops selling small items crafted from the blue-green gem: "It had become an ornamental cottage heritage industry." It took him nine months to track down the jade miners, who finally agreed to lead him up into the mountains. There, at an elevation of 5,700 feet, he found "a giant, economy-size jade vein." Seitz returned several times before discovering the biggest boulders last January. Most of the jade he found is worthless. But one 300-ton monolith does contain three tons of the prized translucent blue-green mineral.
    The find puts to rest one mystery but leaves many questions for archaeologists and pre-Columbian scholars, including: Why did the Olmecs stop carving jade? Perhaps their culture disappeared, or maybe the seams of jade that the Olmecs were mining, and the Olmec carvers themselves, were destroyed by volcanoes. "The deposits," says Seitz, "have been Pompeiied several times."
— Michael Abrams

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The heads range in size from the Rancho La Cobata head, at 3.4 m high, to the pair at Tres Zapotes, at 1.47 m. It has been calculated that the largest heads weigh between 25 and 55 short tons(50 t).
The heads were carved from single blocks or boulders of volcanic basalt, found in the Tuxtlas Mountains. The Tres Zapotes heads, for example, were sculpted from basalt found at the summit of Cerro el Vigía, at the western end of the Tuxtlas. The San Lorenzo and La Venta heads, on the other hand, were likely carved from the basalt of Cerro Cintepec, on the southeastern side, perhaps at the nearby Llano del Jicaro workshop.

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