Worksheet For Identification Of Igneous Rocks Ess 210 lab 6: igneous rock identification . ternary classification of felsic to mafic igneous rocks. the top diagram is for extrusive rocks and the lower is for intrusive rocks. note that rocks with glassy or pyroclastic textures may be described by the above compositions, but that for these specimens the final rock name must still. Intrusive igneous rocks form as magma cools slowly deep in the earth. the slow cooling allows time for large crystals to form. when mineral crystals are so small that they are only visible under the microscope, the igneous rock formed from quickly cooling lava at earth's surface. these rocks are called extrusive.
Igneous Rock Identification Lab Pdf Igneous Rock Rock Geol View lecture 6 lab igneous rock identification.doc from geol misc at lone star college system, woodlands. name: igneous rock identification sample numbe r rock name overall color (light, med.,. Rhyolite. note igneous rock field classification is based relative color of the rock, ultramafic rocks tend to be green olive vine or very dark colored. magic rocks are dark colored black and gray. felsic rocks are light colored white tan pink light gray. field identification. what is the texture of rock sample 3. what visible mineral are present. Igneous rocks (fiery rocks) are made when molten material inside or outside the earth cools and becomes solid. this melted rock is called magma when it is inside the earth. when magma finds its way to the surface through cracks or volcanoes, it is called lava. when lava cools on top of the earth’s surface, it forms extrusive, or volcanic. Color is often an indicator of the composition of a rock or mineral and can be effectively used to identify the composition of most igneous rocks. light colors, including white, light gray, tan and pink, indicate a felsic composition. felsic compositions are rich in silica (sio 2). dark colors, such as black and dark brown, indicate a mafic or.
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