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Igneous Rocks - Geology (U.S. National Park Service)
Fragmental/volcaniclastic igneous rock and sediment: Mineral information, data and localities.
How Are Igneous Rocks Formed? - WorldAtlas
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Igneous rock - Wikipedia
Igneous rocks: left to right: gabbro, andesite, pegmatite, basalt, pumice, porphyry, obsidian, granite, and tuff. | Igneous rock, Rock types, Sedimentary rocks
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Basalt 1 | Igneous rocks form by the cooling & crystallizati… | Flickr