13. (10 pts: 5 pts for mineral or rock and 5 pts for human use of it) Name a min

Question

13. (10 pts: 5 pts for mineral or rock and 5 pts for human use of it) Name a mineral or rock, EXCLUDING any mineral or rock composed of a single element, that constitutes a resource exploited by humans and explain how this resource is used. Note that in years past students have repeatedly used minerals that are composed of a single element--such an answer will be worth ZERO points. Also, do NOT use coal because this is not technically a rock or mineral, either. The same is true of petroleum (not a rock). Coal and petroleum as answers will also be worth ZERO points.

Explanation / Answer

Granite is a plutonic rock in which quartz makes up between 10 and 50 percent of the felsic components and alkali feldspar accounts for 65 to 90 percent of the total feldspar content. Applying this definition requires the mineral identification and quantification abilities of a competent geologist.

Many rocks identified as

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