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Unformatted text preview: Porphyritic light-medium intermediate qtz, k-spar, plag, olivine, biotite slow then rapid intrusive then extrusive 7 Pumice Vesicular light-medium felsic-intermediate micas, qtz, k-spar, plag rapid, gaseous lava extrusive 8 Rhyolite Aphanitic light felsic micas, qtz, k-spar, plag rapid extrusive 9 Scoria Vesicular dark mafic plag, olivine, pyroxene, amphibole rapid extrusive 10 Tuff (volcanic ash) Pyroclastic light-gray felsic-intermediate qz, micas, k-spar, plag rapid extrusive Igneous Rocks Identification Chart: Porphyritic Andesite, Basalt, Diorite, Granite, Obsidian, Pumice, Rhyolite, Scoria, Tuff, Gabrro qtz, plag, k-spar, amphibole, biotite micas, qtz, k-spar, plag, olivine, etc...
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This note was uploaded on 02/17/2011 for the course GEOL 101 taught by Professor Knapp during the Spring '08 term at South Carolina.
- Spring '08