How is a quartz crystal formed?

In igneous rocks, quartz forms as magma cools. Like water that turns into ice, silicon dioxide crystallizes as it cools. Slow cooling generally allows crystals to grow larger. Quartz that grows from silica-rich water is formed in a similar way.

Quartz can be found in all three types of rocks (igneous, metamorphic and sedimentary). Quartz can be formed in different ways. It can be crystallized directly from magma (because it is of igneous origin) and can form during metamorphism as a result of the recrystallization of previous minerals. Quartz is a simple silicate mineral commonly found in the Earth's crust.

Quartz forms in underground solutions rich in silica, and quartz crystals grow in cavities that have sufficient space. These crystals are colored with the help of modern heat treatment of certain types of amethyst crystals that can be found naturally in igneous rocks. Quartz belongs to the tritonal crystal system at room temperature and to the hexagonal crystal system above 573 °C (846 K; 1063 °F). Quartz crystals are made up of billions of stacked tetrahedron shapes that eventually turn into crystals.

Crystalline quartz is found in the form of small crystal glazes that glow on the surface of a rock, as well as well-formed crystals that weigh tons. Pure quartz, traditionally called rock crystal or transparent quartz, is colorless and transparent or translucent, and has often been used for hard stone carvings, such as Lothair crystal. If you're looking for the shape of quartz crystals with golden-yellow needle-shaped rutile inclusions, rutilated quartz crystals are the answer. These ghostly layers form over hundreds of years inside a crystal due to the rest of the hot water solutions trapped inside the cavities of the preformed glass.

Quartz is divided into two groups: crystalline or visible crystals and cryptocrystalline or hidden crystals that require a microscope. However, existing crystals will continue to grow and SiO4 tetrahedrons will be added layer by layer to further improve and complete these existing crystals. The most important distinction between types of quartz is the macrocrystalline variety (individual crystals visible to the naked eye) and the microcrystalline or cryptocrystalline variety (aggregates of crystals visible only at high magnifications).