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Student Igneous RX Chart & Answer Key

Student Igneous RX Chart & Answer Key - Porphyritic...

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GEOL 101 Lab - Spring 2009 Lab 2 : Igneous Rocks Name: Partner's Name: # Rock Name Texture Color Composition Minerals Cooling History Extrusive or Intrusive 1 2 3 4 5 6 7 8 9 10 Igneous Rocks Identification Chart: Porphyritic Andesite, Basalt, Diorite, Granite, Obsidian, Pumice, Rhyolite, Scoria, Tuff, Gabrro
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GEOL 101 Lab - Spring 2009 Lab 2 : Igneous Rocks Name: Partner's Name: # Rock Name Texture Color Composition Minerals Cooling History Extrusive or Intrusive 1 Granite Phaneritic whitish, light felsic qtz, k-spar, mica, etc slow intrusive 2 Basalt Aphanitic dark mafic amphibole, olivine, plag, pyroxene fast extrusive 3 Diorite Phaneritic salt & pepper intermediate slow intrusive 4 Gabbro Phaneritic dark mafic plag, olivine, pyroxene, amphibole slow intrusive 5 Obsidian Glassy gray-dark felsic-mafic very fast, "quenched" extrusive 6 Porphyritic Andesite
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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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