Rocks are defined as aggregates of minerals - in other words, it´s the little bits of minerals, stuck together, that make a rock. The tricky part is that sometimes you can´t see the individual minerals, and you might think you´re looking at one big mineral instead of lots of little ones stuck together.

Although this won´t always be true, as a good rule of thumb, if you find a specimen larger than an inch or so, it´s probably a rock rather than a mineral.

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