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Welt : English : Science : Earth Sciences : Geology : Rocks and Minerals : Igneous Petrology
- 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".
- Greg Finn, Brock University - Page with links to course summaries for Petrology and Petrography, and related coursework.
- 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.
- Rob'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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