Crystals come in all shapes, sizes and colors. A lot of them are born from hot magma deep in the Earth that cools slowly. If you look at a rock, you might even be able to spot some of these crystals.
We can find crystals in nature, but engineers and scientists can also make them in labs. My friend Kelvin Lynn, a materials engineer, is really curious about crystals. He makes them in his lab here at Washington State University.
Read all of this answer from Dr. Universe at https://askdruniverse.wsu.edu/2017/01/30/crystals/.
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