Volcanoes - Articles about volcanoes, volcanic hazards and eruptions past and present.
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Geology.com News contains news about geology and earth science from around the world.
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Dacite - a light-colored extrusive igneous rock intermediate between rhyolite and andesite.
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Minerals: Information about ore minerals, gem materials and rock-forming minerals.
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Oil and Gas - Articles about oil and natural gas in the US and around the world.
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Variscite is a yellowish green to bluish green mineral. It is similar to turquoise and cut as a gem.
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