Question

3. You found a rock and wanted to know its mineral. On scratching it with a
knife, it left a scratch. The mineral is likely to be calcite or topaz. Why?
Ans:​

Answer 1

Answer:

To test the hardness of a specimen take it and try to scratch it with the first rock in your hardness kit, Talc. If it is scratched then the rock you're testing is hardness 1. If not then try to scratch the Talc with your rock. If the rock scratches the Talc then it is harder than the Talc.

Explanation:

Hope this answer will help you

Answer 2

Answer:

To test the hardness of a specimen take it and try to scratch it with the first rock in your hardness kit, Talc. If it is scratched then the rock you're testing is hardness 1. If not then try to scratch the Talc with your rock. If the rock scratches the Talc then it is harder than the Talc.

Explanation:

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