To a casual observer, a rock and a mineral appear to be very much alike. However, to a geologist, a rock is something much different from a mineral. A mineral is a combination of two or more elements, while a rock is a combination of 2 or more minerals. You can learn more fun facts about rocks and minerals by investing in this collection. Sixteen common rocks and minerals are featured on this 4 X 6 card, along with interesting information included on the back of the card.
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