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Igneous Petrology Home : Earth Sciences : Geology : Rocks and Minerals : Igneous Petrology Directory Listing(s) • Geokem 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'. • Northwest 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. • Pegmatite International Information on the mineralogy and petrology of pegmatites including an online publication and links to pegmatite-related sites.

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