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Maslowich
3 years ago
15

what is a mineral's estimated hardness if it can scratch a fingernail, penny, steel plate, and glass?

Biology
2 answers:
liraira [26]3 years ago
7 0

Answer:

5.5

Explanation:

Instead, common objects are used as tools to perform the hardness test: fingernail (hardness = 2.5) copper penny (hardness = 3) glass plate or steel knife (hardness = 5.5)

Nady [450]3 years ago
6 0

Answer:

5.5

Explanation:

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