Download - Igneous Rocks
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Igneous RocksFrom lava or magma
Can be either extrusive (formed on Earth’s surface, from lava)Or intrusive (formed inside of the Earth’s surface, from magma)
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1. Granite•Intrusive (inside the Earth)•Light colored•High quartz content
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2. Gabbro•Intrusive (inside the Earth)•Dark colored•Lower silica content
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3. Rhyolite•Extrusive•Light colored (pinkish)•High quartz content
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4. Basalt•Extrusive•Dark colored•Lower silica
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5. Felsite•Extrusive•Light colored (light gray or whitish)•High in quartz
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6. Pumice•Extrusive•“Fluffy” rock•Will float in water (until it gets water-logged)
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7. Obsidian•Extrusive•Volcanic glass•Was used for arrowheads
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Sedimentary RocksFormed from sediment
Can be either clastic (from little pieces)Chemical (settled from water)
Or Organic/Biochemical (from living things)
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1. Conglomerate•Clastic•Contains larger rounded clasts (parts)
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2. Sandstone•Clastic•Contains sand-sized grains
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3. Shale•Clastic – although it doesn’t look like it•Made from mud or silt
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4. Rock Salt•Chemical•Forms from the evaporation of water from salty oceans or lakes
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5. Chert (or flint)•Chemical•Forms from the growth of silicon dioxide crystals
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6 & 7. Limestone• Chemical or Biochemical• Formed from precipitation of calcium carbonate from water
(chemical)• OR from the accumulation of shells, corals, and alga material
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8. Coal•Biochemical•Formed from the accumulation of plant material, usually in a swampy environment
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Metamorphic RocksChanged Rocks
Can be either foliated or non-foliated
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1. Marble•Non-foliated (not stripe-y)•Made from limestone (calcium carbonate)
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2. Quartzite• Non-foliated•Made from sandstone (mostly quartz)
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3. Amphibolite•Non-foliated•Made of amphibole and plagioclase, very little quartz
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4. Slate•Foliated (has “layers”…like an onion…) http://www.youtube.com/watch?v=x2m_hwDlntw•Made from shale
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5. Phyllite•Foliated•Made of fine grained mica•Usually lustrous
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6. Gneiss•Foliated•Has lots of quartz and feldspar
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7. Schist•Foliated•Contains mica, which allows it to split often