Rock_Identification_10 - or fragments of several coarse...

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Table 2.2 Igneous rock identification chart. Specimen Number Texture Color (light- intermediate- dark) Dominant Minerals Rock Name pieces or fragments of mineral and/or rock material. They are the detrital sedimentary rocks. Do not include any rocks that have abundant shells or shell fragments. You may find the photographs of the detrital sedimentary rocks in Figures 2.8-2.11 helpful. The remaining sedimentary rocks, those with shells or shell fragments and those that consist of crystals, are the chemical rocks. Pick up each detrital rock specimen and rub your finger over it to feel the size of the grains or fragments. 13. How many of your detrital specimens feel rough like sand? How many feel smooth like mud or clay? Use a hand lens or microscope to examine the grains
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Unformatted text preview: or fragments of several coarse detrital rock specimens. Notice that they are not crystals. a. Observe the material surrounding the grains or fragments in the rock specimen closely with a hand lens or microscope. The material is (course, fine). Circle your answer. b. Write a brief description of the detrital rock specimen you have examined. 14. Observe your specimens. . Two of the minerals that often comprise the grains of detrital sedimentary rocks are quartz, a hard (hardness = 7) mineral with a glassy luster, and clay, a soft, fine mineral that consists of microscopic platy particles. The difference in appearance and hardness of quartz and clay is helpful in distinguishing them....
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This note was uploaded on 04/03/2011 for the course PHYS 114 taught by Professor Comptonw during the Summer '10 term at Purdue University-West Lafayette.

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