Smoky Quartz

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Smoky Quartz. Telli-tal route, high Alps, Uri, Switzerland. Pure quartz crystals are colorless--color generally comes from impurities, or in the case of smoky quartz, natural irraditiation of aluminum-bearing material. Smoky quartz is common in the Alps. There seems to be a relationship between the elevation at which the source is found and its darkness.
Smoky Quartz. Telli-tal route, high Alps, Uri, Switzerland. Pure quartz crystals are colorless--color generally comes from impurities, or in the case of smoky quartz, natural irraditiation of aluminum-bearing material. Smoky quartz is common in the Alps. There seems to be a relationship between the elevation at which the source is found and its darkness.
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