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| | Volcanoes - Geology, Earth Sciences, Science 123
 GeokemGeokem
 Online publication with brief descriptions of most types of terrestrial and lunar igneous rocks, their regional distribution and classification, and examples of their geochemical trends and "fingerprints".
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Greg Finn, Brock UniversityGreg Finn, Brock University
 Page with links to course summaries for Petrology and Petrography, and related coursework.
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Northwest Obsidian Research LabNorthwest Obsidian Research Lab
 Offers a variety of analytical services related to obsidian trace element characterization ("sourcing") studies, obsidian hydration studies, and obsidian source studies, primarily in the context of archaeological research.
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Pegmatite InternationalPegmatite International
 Information on the mineralogy and petrology of pegmatites including an online publication and links to pegmatite-related sites.
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Rob's Granite PageRob's Granite Page
 This site is devoted to granite petrology with an emphasis on the Llano Uplift granites of central Texas. Also includes links to research, meetings and other scientists.
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