First, you will select one of the minerals. Try to scratch the mineral with your fingernail. If the mineral is scratched it is less hard than a fingernail. If the mineral isn't scratched, it is harder than a fingernail. Write down the results, then repeat the process using the rest of the equivalent items on the rest of the minerals. Good luck!
Source:
Smithsonian Rock and Fossil Hunter by Ben Morgan
Source:
Smithsonian Rock and Fossil Hunter by Ben Morgan