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1 2 Plagioclase (more crystallization!) Silica goes up more and iron goes down more! Pyroxene Plagioclase Pyroxene This is called Differentiation K feldspar Hornblende quartz 3 4 http://volcanoes.usgs.gov/ 1. Magmas are more viscous than solid rocks in the crust and upper mantle. 2. Most magmas are richer in silica than most crustal and upper mantle rocks. 3. Magmas are mainly liquid and contain dissolved fluids such as water; most are less dense than the adjacent solid rock. 4. All of the above. 5 Rock number Texture Intrusive or Volcanic Rock Name B1 B2 B3 B4 B5 B6 B7 B8 B9 B10 B11 B12 B13 B14 B15 B16 6 Rock number Texture Intrusive or Volcanic Rock Name Rock number Texture B1 Fragmental B1 Fragmental B2 Phaneritic B2 Phaneritic B3 Porphyritic (aphanitic) B3 Porphyritic (aphanitic) B4 Phaneritic B4 Phaneritic B5 Vesicular (aphanitic) B5 Vesicular (aphanitic) B6 Phaneritic B6 Phaneritic B7 Aphanitic (porphyritic) B7 Aphanitic (porphyritic) B8 Phaneritic B8 Phaneritic B9 Porphyritic (aphanitic) B9 Intrusive or Volcanic Volcanic Volcanic Volcanic Porphyritic (aphanitic) Volcanic B10 Glassy B10 Glassy Volcanic B11 Phaneritic B11 Phaneritic B12 Vesicular B12 Vesicular Volcanic B13 Fragmental B13 Fragmental Volcanic B14 Phaneritic (pegmatitic) B14 Phaneritic (pegmatitic) B15 Phaneritic B15 Phaneritic B16 Fragmental B16 Fragmental Rock number Texture B1 Fragmental B2 Phaneritic B3 Porphyritic (aphanitic) B4 Phaneritic B5 Vesicular (aphanitic) B6 Phaneritic B7 Aphanitic (porphyritic) B8 Phaneritic B9 Intrusive or Volcanic Rock Name Volcanic Volcanic Rock Name Volcanic Tuff Volcanic Andesite Volcanic Scoria Volcanic Rhyolite Porphyritic (aphanitic) Volcanic Basalt B10 Glassy Volcanic Obsidian B11 Phaneritic B12 Vesicular Volcanic Pumice B13 Fragmental Volcanic Volcanic breccia B14 Phaneritic (pegmatitic) B15 Phaneritic B16 Fragmental Volcanic Welded tuff 7
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