Luster is a mineral property.

Streak is a mineral property

Hardness is a mineral property.

We use minerals to make jewelry, coins, metal objects, plaster, and wires.

There are 3 types of rocks ( igneous, sedimentary, metamorphic).

Igneous rock form when melted rock hardens.

Sedimentary rocks form over a long period of time by layers.

Metamorphic rocks form when a rock is put under great heat and pressure.

Rocks can change over time.

In the rock cycle rocks change from one kind of rock to another.