There are five primary types of intrusive igneous rocks with these large crystals: granite, pegmatite, diorite, gabbro and peridotite.
The crystals form in nature when molecules gather to stabilize when liquid starts to cool and harden, this process is called crystallization.
How are crystals formed? Crystals form in nature when molecules gather to stabilize when liquid starts to cool and harden. This process is called crystallization and can happen when magma hardens or when water evaporates from a natural mixture too.