igneous rocks
DESCRIPTION
Igneous Rocks. From 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). 1. Granite. Intrusive (inside the Earth) Light colored High quartz content. 2. Gabbro. Intrusive (inside the Earth) - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Igneous Rocks](https://reader035.vdocuments.us/reader035/viewer/2022062302/5681672c550346895ddbcabb/html5/thumbnails/1.jpg)
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)
![Page 2: Igneous Rocks](https://reader035.vdocuments.us/reader035/viewer/2022062302/5681672c550346895ddbcabb/html5/thumbnails/2.jpg)
1. Granite•Intrusive (inside the Earth)•Light colored•High quartz content
![Page 3: Igneous Rocks](https://reader035.vdocuments.us/reader035/viewer/2022062302/5681672c550346895ddbcabb/html5/thumbnails/3.jpg)
2. Gabbro•Intrusive (inside the Earth)•Dark colored•Lower silica content
![Page 4: Igneous Rocks](https://reader035.vdocuments.us/reader035/viewer/2022062302/5681672c550346895ddbcabb/html5/thumbnails/4.jpg)
3. Rhyolite•Extrusive•Light colored (pinkish)•High quartz content
![Page 5: Igneous Rocks](https://reader035.vdocuments.us/reader035/viewer/2022062302/5681672c550346895ddbcabb/html5/thumbnails/5.jpg)
4. Basalt•Extrusive•Dark colored•Lower silica
![Page 6: Igneous Rocks](https://reader035.vdocuments.us/reader035/viewer/2022062302/5681672c550346895ddbcabb/html5/thumbnails/6.jpg)
5. Felsite•Extrusive•Light colored (light gray or whitish)•High in quartz
![Page 7: Igneous Rocks](https://reader035.vdocuments.us/reader035/viewer/2022062302/5681672c550346895ddbcabb/html5/thumbnails/7.jpg)
6. Pumice•Extrusive•“Fluffy” rock•Will float in water (until it gets water-logged)
![Page 8: Igneous Rocks](https://reader035.vdocuments.us/reader035/viewer/2022062302/5681672c550346895ddbcabb/html5/thumbnails/8.jpg)
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)
![Page 11: Igneous Rocks](https://reader035.vdocuments.us/reader035/viewer/2022062302/5681672c550346895ddbcabb/html5/thumbnails/11.jpg)
2. Sandstone•Clastic•Contains sand-sized grains
![Page 12: Igneous Rocks](https://reader035.vdocuments.us/reader035/viewer/2022062302/5681672c550346895ddbcabb/html5/thumbnails/12.jpg)
3. Shale•Clastic – although it doesn’t look like it•Made from mud or silt
![Page 13: Igneous Rocks](https://reader035.vdocuments.us/reader035/viewer/2022062302/5681672c550346895ddbcabb/html5/thumbnails/13.jpg)
4. Rock Salt•Chemical•Forms from the evaporation of water from salty oceans or lakes
![Page 14: Igneous Rocks](https://reader035.vdocuments.us/reader035/viewer/2022062302/5681672c550346895ddbcabb/html5/thumbnails/14.jpg)
5. Chert (or flint)•Chemical•Forms from the growth of silicon dioxide crystals
![Page 15: Igneous Rocks](https://reader035.vdocuments.us/reader035/viewer/2022062302/5681672c550346895ddbcabb/html5/thumbnails/15.jpg)
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
![Page 16: Igneous Rocks](https://reader035.vdocuments.us/reader035/viewer/2022062302/5681672c550346895ddbcabb/html5/thumbnails/16.jpg)
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)
![Page 19: Igneous Rocks](https://reader035.vdocuments.us/reader035/viewer/2022062302/5681672c550346895ddbcabb/html5/thumbnails/19.jpg)
2. Quartzite• Non-foliated•Made from sandstone (mostly quartz)
![Page 20: Igneous Rocks](https://reader035.vdocuments.us/reader035/viewer/2022062302/5681672c550346895ddbcabb/html5/thumbnails/20.jpg)
3. Amphibolite•Non-foliated•Made of amphibole and plagioclase, very little quartz
![Page 21: Igneous Rocks](https://reader035.vdocuments.us/reader035/viewer/2022062302/5681672c550346895ddbcabb/html5/thumbnails/21.jpg)
4. Slate•Foliated (has “layers”…like an onion…) http://www.youtube.com/watch?v=x2m_hwDlntw•Made from shale
![Page 22: Igneous Rocks](https://reader035.vdocuments.us/reader035/viewer/2022062302/5681672c550346895ddbcabb/html5/thumbnails/22.jpg)
5. Phyllite•Foliated•Made of fine grained mica•Usually lustrous
![Page 23: Igneous Rocks](https://reader035.vdocuments.us/reader035/viewer/2022062302/5681672c550346895ddbcabb/html5/thumbnails/23.jpg)
6. Gneiss•Foliated•Has lots of quartz and feldspar
![Page 24: Igneous Rocks](https://reader035.vdocuments.us/reader035/viewer/2022062302/5681672c550346895ddbcabb/html5/thumbnails/24.jpg)
7. Schist•Foliated•Contains mica, which allows it to split often