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Mine Attractions In Queretaro

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Querétaro , officially the Free and Sovereign State of Querétaro , is one of the 32 federal entities of Mexico. It is divided into 18 municipalities. Its capital city is Santiago de Querétaro. It is located in North-Central Mexico, in a region known as Bajío. It is bordered by the states of San Luis Potosí to the north, Guanajuato to the west, Hidalgo to the east, México to the southeast and Michoacán to the southwest. The state is one of the smallest in Mexico, but it is also one of the most heterogeneous geographically, with ecosystems varying from deserts to tropical rainforest, especially in the Sierra Gorda, which is filled with microecosys...
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Mine Attractions In Queretaro

  • 1. Opal Mines Tequisquiapan
    Opal is a hydrated amorphous form of silica ; its water content may range from 3 to 21% by weight, but is usually between 6 and 10%. Because of its amorphous character, it is classed as a mineraloid, unlike crystalline forms of silica, which are classed as minerals. It is deposited at a relatively low temperature and may occur in the fissures of almost any kind of rock, being most commonly found with limonite, sandstone, rhyolite, marl, and basalt. Opal is the national gemstone of Australia.There are two broad classes of opal: precious and common. Precious opal displays play-of-color, common opal does not. Play-of-color is defined as a pseudochromatic optical effect resulting in flashes of colored light from certain minerals, as they are turned in white light. The internal structure of pre...
    From Wikipedia, the free encyclopedia.

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