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Physics 8 Online
OpenStudy (anonymous):

A fine-grained rock has the following mineral composition: 50% potassium feldspar (orthoclase), 26% quartz, 13% plagioclase feldspar, 8% biotite mica, and 3% of the biotite mica. The rock would most likely be: 1. granite 2. rhyolite 3. gabbro 4. basalt

OpenStudy (goformit100):

4. basalt

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