Gems, Rocks, and Minerals of the U.S.A.

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Two great starter samples for the young geologist. 16 semi-precious gemstones of the U.S. on a 4 x 6 inch card and a collection of 16 common rocks and minerals on a 4 x 6 inch card. Facts about the gems, rocks and minerals are printed on the back of the cards.  The samples are small, about the size of a dime. but a great introduction to geology.