EARTH MATERIALS EQ:What are igneous rocks? An igneous rock is a naturally occurring solid that forms from a hot liquid mineral assemblage that cools and.

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Presentation transcript:

EARTH MATERIALS EQ:What are igneous rocks? An igneous rock is a naturally occurring solid that forms from a hot liquid mineral assemblage that cools and freezes. Igneous Rock Primer CLASSROOM UNSQUARED

Igneous Rock Classification (Identification Key)Identification Key COMPOSITION TEXTURETEXTURE Felsic (light color) IntermediateMafic (dark color) Ultramafic Large Crystals (Intrusive or Plutonic) GraniteDioriteGabbroPeridotite Fine/no Crystals (Extrusive or Volcanic) RhyoliteAndesiteBasalt Large and Fine Crystals Porphyry Vesicular (Extrusive) PumiceScoria Glassy (Extrusive) Obsidian Fragmented (Extrusive) Tuff Quartz Orthoclase Na-plagioclase Muscovite Na-Ca plag. Amphibole Ca-plag. Pyroxene Olivine

Name and classify these rocks! 1

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Answers to ID Test 1. Felsic intrusive - granite 2. Felsic extrusive - rhyolite 3. Mafic extrusive - basalt 4. Mafic intrusive - gabbro 5. Mafic vesicular - scoria 6. Mafic glassy - obsidian 7. Intermediate intrusive - diorite 8. Intermediate extrusive – andesite 9. Intermediate fragmented - tuff 10. Intermediate int./ext. – porphyry

Separation of Minerals in a Partial Melt

Igneous Rock Bodies

Mafic Composition Felsic Composition

What are these volcanic features?

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