You are asked to pick a rock to make your great Aunt Petunia's headstone. You have been asked to pick the most durable headstone available and cost is no issue. What rock would most likely make the most durable and chemically resistant headstone in a humid environment?
A. a granite with a very high percentage of quartz and no fractures
B. a limestone with many cracks filled with calcite
C. a shale cemented with calcite and iron
D. a marble with fine crystals of calcite
E. a quartz sandstone cemented with calcite
Answer: A
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