There are a lot of myths about crystals − for example, that they are magical rocks with healing powers. An earth scientist explains some of their amazing true science.

Watch igneous rocks, the solidified products of molten magma or lava that form some of Earth’s most intriguing geological features. Igneous rocks are classified based on where and how they solidify: ...

They do this in a uniform and repeating pattern that forms the crystal. Crystals can form when liquid rock (magma) cools. Many valuable crystals, such as diamonds and emeralds, form this way.

While crystals can form when liquid rock, called magma, cools, they can also form from other liquids. Solutions containing minerals can become concentrated by evaporation and deposit crystals.

Are all minerals crystals? How are diamonds cut? How do geodes form? Is the Hope Diamond actually cursed? This rock and mineral expert answers all these questions and more.