* All rocks contain minerals. Rocks are made up of one or more minerals. Think of it like a cake. The cake is the rock, and the ingredients (flour, sugar, eggs, etc.) are the minerals.
* Some rocks are made up of a single mineral. For example, limestone is mostly made up of the mineral calcite.
* Many rocks are made up of multiple minerals. Granite is a common example. It contains quartz, feldspar, and mica.
So, instead of saying "a rock that contains minerals", it's more accurate to say:
* "A rock is a naturally occurring solid made up of one or more minerals."
