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Earth Materials
Minerals | Rocks

Variation of Quartz
One Mineral - many Forms and Colors

Quartz (SiO2) is one of the most common minerals in the Earth's continental crust and forms through direct crystallization from magmas and hydrothermal solutions at relative low-temperature.

Quartz occurs in macrocrystalline (individual crystals visible to the unaided eye) and microcrystalline or cryptocrystalline varieties (aggregates of crystals visible only under high magnification). Macrocrystalline varieties are commonly transparent such as Rock Crystals, Amethyst, Rose Quartz and Citrine.

This is a crystal of Quartz

One of the most common minerals in the Earth's crust.
Like everything in the Universe, it is made of atoms.

Why are the faces flat?

Crystals grow as atoms are added layer by layer, just as a brick wall is built row by row. Notice, however, that the faces on this crystal are not completely flat. Some areas grew faster than others producing pumps and ridges.

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