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Difference between rocks and minerals

A mineral is a single non-living substance.  Minerals are the building blocks that rocks are made of.  Even though you cannot always see the different minerals in a rock, rocks are made from more than one mineral mixed together.  It can be hard to tell if a specimen is a rock or a mineral; one important clue to deciding is color.  Rocks may be one color or several colors, but minerals are always one color.  Minerals may also have a crystal shape while rocks do not.