1 phaneritic 2 porphyritic 3 aphanitic 4 glassy 5 pyroclastic 6 pegmatitic An

1 phaneritic 2 porphyritic 3 aphanitic 4 glassy 5

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1. phaneritic 2. porphyritic 3. aphanitic 4. glassy 5. pyroclastic 6. pegmatitic
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An igneous rock that has no crystals at all has what type of texture? 1. phaneritic 2. porhyritic 3. aphanitic 4. glassy 5. pyroclastic 6. pegmatitic
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An igneous rock in which all of the crystals are microscopic has what type of texture? 1. phaneritic 2. porhyritic 3. aphanitic 4. glassy 5. pyroclastic 6. pegmatitic
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An igneous rock made of volcanic ash that erupted explosively from a volcano has what kind of texture? 1. phaneritic 2. porhyritic 3. aphanitic 4. glassy 5. pyroclastic 6. pegmatitic
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List the three volcanic rock types in order from most felsic to most mafic List the four plutonic rocks in order from most felsic to most mafic
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9. Which volcanic rock has the same composition as granite? 1. andesite 2. basalt 3. rhyolite 4. diorite
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10. Which plutonic rock has the same composition as andesite? 1. granite 2. diorite 3. gabbro 4. peridotite
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11. Gabbro is 1. A volcanic rock with the same composition as diorite 2. A volcanic rock with the same composition as basalt 3. A plutonic rock with the same composition as rhyolite 4. A plutonic rock with the same composition as basalt
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12. List common silicate minerals in the order in which the crystallize in a cooling magma body 1. Quartz, orthoclase, biotite, amphibole, pyroxene, olivine 2. Quartz, biotite, orthoclase, pyroxene, amphibole, olivine 3. Olivine, pyroxene, amphibole, biotite, orthoclase, quartz 4. Olivine, amphibole, biotite, orthoclase, pyroxene, quartz
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16. What type of magma is generated at divergent plate boundaries? 1. Granitic (felsic) 2. Dioritic (intermediate) 3. Basaltic (mafic) 4. Peridotitic (ultramafic)
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Intrusive or Extrusive? volcanic rocks (E) Intrude into pre-existing rocks (I) Cool slowly underground (I) Extrude out of the earth onto the ground surface (E) All crystals large enough to be seen by the naked eye (I) Some or all crystals too small to be seen by the naked eye (E) aphanitic texture (E) plutonic rocks (I) Cool rapidly above ground (E) Phaneritic texture (I) Finger Signals– I or E
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Classification of Igneous Rocks Felsic Intermediat e Mafic Ultra-mafic Coarse- grained (plutonic) Granite Diorite Gabbro Peridotite Fine- grained (volcanic) Rhyolite Andesite Basalt N/A
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Phaneritic texture means 1. All of the crystals are large enough to be seen by the naked eye 2. None of the crystals are large enough to be seen by the naked eye 3. Some of the crystals are large enough to be seen by the naked eye
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An igneous rock in which some crystals are visible to the naked eye, but others are microscopic has what kind of texture? 1. phaneritic 2. porphyritic 3. aphanitic 4. glassy 5. pyroclastic 6. pegmatitic
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An igneous rock that has no crystals at all has what type of texture? 1. phaneritic 2. porhyritic 3. aphanitic 4. glassy 5. pyroclastic 6. pegmatitic
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An igneous rock in which all of the crystals are microscopic has what type of texture?
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  • Spring '14
  • Kaiser
  • Plate Tectonics, Basalt, Sedimentary Rock Interpretation, c. Convergent

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