Rock_Identification_11

Rock_Identification_11 - 15 How many of your detrital...

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15. How many of your detrital specimens are made of quartz, and how many appear to be made of clay? _____ specimens have quartz grains and _____ have clay grains As a result of their method of formation, many chemical sedimentary rocks are fine-to-coarse crys- talline while others consist of shells or shell fragments. 16. How many of your chemical sedimentary rocks are crystalline, and how many contain abundant shells or shell fragments? _____ specimens are crystalline and _____ contain shells or shell fragments Limestones, Figures 2.12-2.13, are the most abun- dant chemical sedimentary rocks. They have several orgins and many different varieties; however, one thing that all limestones have in common is that they are made of the calcium carbonate mineral called cal-cite. Calcite can precipitate directly from the sea to form limestone or can be used by marine organisms to make shells. After the organisms die, the shells become sedi- ment and eventually the sedimentary rock limestone. Calcite is a mineral that reacts with dilute hy-
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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.

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Rock_Identification_11 - 15 How many of your detrital...

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