What is the softest mineral on the Moh's Hardness Scale?

Who invented the Hardness Scale?

What can scratch a diamond?

What is another name for Pyrite?

What is the second hardest mineral on the Hardness scale?

What mineral protects our teeth from cavities?

All of the following are mineral's that we can eat except...

Which is a physical property of a mineral?

Our bodies need..................... to survive

How many types of crystals are there?

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