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Question: solve problem 12 ab and c amp problem 13 please...

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Solve: Problem 1.2 A,B and C. & Problem 1.3. Please show work. Dont understand.
Problem 1.2. Determine the rock names for coarse grained rock samples with the following mineral proportions. A B C Alkali feldspar 15 3 0 Plagioclase 46 64 92 Quartz Biotite Hornblende 13 15 5 Other 2 11 0 Problem 1.3. A coarse-grained rock sample consists of 15 percent plagioclase, 35 percent augite, and 50 percent enstatite, What is the name of this rock according to the IUGS classification?
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