What are Minerals?

On the Moh's scale, a mineral with a higher mineral can scratch another mineral with a lower or equal number.

What is hardness?

The color of minerals may vary, but its streak is always the same?

A mineral can be in different colors?

calcite is the hardest mineral?

Can you scratch hardness minerals with a finger nail?

A diamond can't be scratch by any mineral except another diamond.

What can attract things that have iron in them?

What minerals have copper, gold and silver?

What is used to measure the hardness?

What describes how minerials reflect light?

Look at the picture shown. Are they all quartz?