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March-April 2010

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New Extraordinary Nifontovite Specimens from Charcas, San Luis Potosí, Mexico

The Charcas mine (fig. 1) is located 4 kilometers to the northwest of the small town of Charcas at an elevation of about 2,175 meters above sea level (see fig. 2). It is situated 110 kilometers north-northwest of the city of San Luis Potosí, capital of the state of San Luis Potosí, Mexico. This Zn-Pb-Ag-Cu mine became famous for the world's finest danburite crystals as well as for its great variety of beautiful calcite and superb natural citrine crystals. Green datolite is another common gangue mineral. Furthermore, two rare boron mineral species have been discovered at the Charcas mine: bakerite and nifontovite. Currently, the mine is operated by Industrial Minera Mexico (IMMSA), a subsidiary of Grupo Mexico.

Matthias Jurgeit holds a degree in mineralogy and is a worldwide exploration geologist based in Germany. He is also a mineral dealer specializing in the minerals of Mexico.

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