Rocks & Minerals Safety - Streak and Hardness tests: I have a safety question on Pearsons 91 activity “comparing minerals”.

Rocks & Minerals Safety - Streak and Hardness tests: I have a safety question on Pearsons 91 activity “comparing minerals”.
This information sheet is an updated review of the answers to the following questions, and replaces the previously published Q&As:
This online resource looks at the properties of different rock types.