Discussion
On the Mohs scale, the mineral that will scratch window glass but is itself scratched by corundum is
Answer: A
Correct answer: quartz
Window glass is about 5.5 and corundum is 9, so the mineral lies between them, and quartz at 7 is the common mineral in that gap. It is also the standard field test: a mineral that scratches glass is at least about 5.5, and among ordinary rock-forming minerals that usually means quartz.
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