Does slate scratch glass?

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6. What color is light Slate?
7. Where is Slate found?
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Tags

1. #steel
2. #metamorphic
3. #which
4. #scratch
5. #minerals
6. #hardest
7. #slate
8. #enough
9. #using
10. #glass
11. #scale
12. #ranks
13. #ranges
14. #being
15. #measured
16. #softest
17. #rocks
18. #hardness