Rocks are made from materials called . One way of naming a mineral is to look at the it leaves after rubbing it. A mineral can also be identified by its color and . Rocks form in one of three different ways. There are types of rocks: igneous, sedimentary, and metamorphic. An example of a type of rock that is made from squeezing and heating is . People use rocks and minerals too. People use rocks to make roads, walls, and buildings. People cannot live without the mineral .