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defon
3 years ago
12

A mineral leaves a gray trail when scraped against an unglazed porcelain plate.

Biology
2 answers:
balandron [24]3 years ago
5 0
D. Hardness.

A measure of hardness is the property that a material scratches or be scratched.

The principle is that a harder material will scratch a softer one.
schepotkina [342]3 years ago
3 0
It's D Hardness, Which is not a material luster,streak and color All are involved With each other in any rock
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