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Rocks we know

Rocks we know. Basalt. Igneous Rock Extrusive Fine grain low in silica = dark. Breccia. Sedimentary Clastic Large , sharp grain. Coal. Sedimentary Organic Layers of plant a nd animal remains. conglomerate. Sedimentary Fine grained Soft, round grain clastic. Granite.

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Rocks we know

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  1. Rocks we know

  2. Basalt • Igneous Rock • Extrusive • Fine grain • low in silica = dark

  3. Breccia • Sedimentary • Clastic • Large , sharp grain

  4. Coal • Sedimentary • Organic • Layers of plant and animal remains

  5. conglomerate • Sedimentary • Fine grained • Soft, round grain • clastic

  6. Granite • Igneous • Intrusive • Coarse grain • Mineral composition: quartz, mica, feldspar • High silica = light color

  7. Limestone • Sedimentary • Organic - Hard shells of living things • Chemical – calcite is dissolved in lakes and forms crystals

  8. Marble • Metamorphic • Formed from limestone • Non-foliated

  9. Sandstone • Sedimentary • Clastic • Needs cementation and compaction

  10. Shale • Sedimentary • Fine grained • Clastic • No cementation

  11. Slate • Metamorphic • Formed from shale • Fine grained • foliated

  12. Igneous Rocks • Intrusive Igneous Rocks: magma pushes into surrounding rock below the Earth’s surface • Extrusive Rocks: forms when magma erupts onto the Earth’s surface (lava), cools quickly with very small or no crystals formed http://www.windows.ucar.edu/tour/link=/earth/geology/ig_intrusive.html&edu=high&fr=t

  13. Igneous Rocks Coarse-Grained Fine-Grained Granite Basalt

  14. Sedimentary Rock Clastic – made of fragments of rock cemented together with calcite or quartz Breccia is a term most often used for clastic sedimentary rocks that are composed of large sharp-edged framents. The spaces between the large fragments can be filled with a mixture of smaller particles or a mineral cement that binds the rock together.

  15. Sedimentary Rock Chemical sedimentary – minerals crystallize out of solution to become rock Limestone is a sedimentary rock composed primarily of calcium and it commonly forms in clear, warm, shallow marine waters. It is usually an organic sedimentary rock that forms from the accumulation of shell, coral, other marine items.

  16. Sedimentary Rock Organic sedimentary – remains of plants and animals Coal is an organic sedimentary rock that forms from the accumulation and preservation of plant materials, usually in a swamp environment.  Coal is a one of the three most important fossil fuels. 

  17. Metamorphic Rock • Non-Foliated – mineral grains are not arranged in plains or bands Marble is a non-foliated metamorphic rock that is produced from limestone.

  18. Metamorphic Rock • Foliated - contain aligned grains of flat minerals Gneiss is foliated metamorphic rock.

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