Question

Bubba wants to determine a mineral’s hardness because he loves them so much. He can scratch the mineral with an iron nail but cannot scratch the mineral with a penny. What is the approximate hardness of Bubba’s mineral? A. Less than 2.5.

B. 4.5 to 5.5

C. 3.5 to 4.5

D. 2.5 to 3.5

Answer 1

Answer: it is 3.5 to 4.5 C. On EDGE

Explanation: Hardness of Common Objects

2.5 - fingernail

3. - copper penny

4. - iron nail

5.5 - glass

(Mohs Hardness Scale)