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Описание: Pictures, links, and a brief description of the properties and applications of this siliceous rock.
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Gallery of rock, mineral and fossil pictures by name, and earthquake pictures by event.
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Learn how to start rock hounting, links to rock and gem web sites.
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Provides information on becoming a gemologist. Offers testing equipment, books, tutorials and courses.
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USGS reformatted geochemical data for Arminto quadrangle.
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Archive of articles and graphical data related to plate tectonics.
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Focuses in the research of climatic reconstruction of glacial and post-glacial times; polar ice-sheets; dynamics, history and ice-atmosphere interactions; ...
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Bob's Rock Shop is the net's first 'zine for mineral collectors, rockhounds and lapidary hobbyists, now joined online by Rock&Gem magazine. Among the features to ...
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USGS Mineral Resources Program Home Page: A source of unbiased information on the occurrence, quality, quantity, and availability of mineral resources. This ...
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