How hard is rock?

Seb and Joe found out that a man called Mr Moh invented a scale of hardness, which we call the Moh scale.
Samuel reminded us that diamond is the hardest rock.
Seb and Joe also discovered that talc is the softest rock.

Due to the different properties of rocks and minerals, we use different rocks for different purposes.

Would you make a floor tile out of chalk? Why?
Would you make a roof tile out of diamond? Why?
Would you use granite for a wind screen (windshield)? Why

We use rocks for different purposes, because of their properties.

Here are some other interesting rock facts and questions which really make you think about how often we use rocks and minerals.

Here is a great site which shows how rocks and minerals are used around the home.