L3_IntIgRocks

L3_IntIgRocks - Naturally Occurring Inorganic Solid Element...

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Unformatted text preview: Naturally Occurring Inorganic Solid Element or Compound Crystalline Structure Consistent Chemical Composition BUILDING BLOCKS OF ROCKS Naturally formed Consolidated material (aggregates) Composed of grains of one or more minerals Igneous Formed from the cooling of molten rock Sedimentary Formed from the consolidation of sediment Metamorphic Formed from changes due to temperature and pressure Where and how the rocks form Composed of Minerals Instrusive Plutonic Magma Extrusive Volcanic Lava Aphanitic Fine-grained Most crystals <1 mm Phaneritic Coarse-grained Most crystals >1 mm Glassy No crystal development Porphyritic Coarse grains in a fine-grained matrix Pegmatite Very coarse grained Most crystals >5 cm Mafic 50% silica, dark Felsic >65 % silica, light colored (pink) Intermediate 50 65% silica, gray Ultramafic <45% silica, ferromagnesian minerals Calvin and Hobbes by Will Watterson...
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This note was uploaded on 03/12/2011 for the course GEOL 1113 taught by Professor Manger during the Spring '07 term at Arkansas.

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L3_IntIgRocks - Naturally Occurring Inorganic Solid Element...

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