Any sites related to Igneous rocks and their study, rather than individual minerals, unless discussed in an entirely igneous setting.
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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.
Last update:June 12, 2016 at 10:15:07 UTC