Quartz crystal clear

Clear quartz crystal, one of the purest varieties of the most abundant mineral in the Earth's crust.

About this subject

Clear quartz, also known as rock crystal, is the purest form of silicon dioxide (SiO₂). It is one of the most common minerals on Earth, making up about 12% of the continental crust. Its formation occurs in hydrothermal veins and pegmatites, where crystals can reach enormous sizes, the largest ever found weighed over 44 tons, discovered in Minas Gerais, Brazil.

This mineral is widely used in the electronics industry, primarily in quartz oscillators that regulate the frequency of clocks, radios, and computers. Its piezoelectric property generates an electric charge under pressure, essential for sensors and precision devices. Additionally, quartz is a raw material for specialty glass and optical fibers.

In human history, clear quartz has been used as a tool and ornament since prehistoric times. Ancient civilizations believed it was petrified ice and used it in healing rituals. Today, it is valued in mineral collections and as a gemstone, especially when faceted. Brazil is one of the world's largest producers of quartz crystals, with notable deposits in states such as Minas Gerais, Bahia, and Goiás.

Interestingly, clear quartz can contain liquid or gaseous inclusions, and if doped with iron, it can form amethyst or citrine. It is also used in alternative therapies, although there is no scientific evidence of effects beyond placebo.

Frequently Asked Questions

What is the hardness of clear quartz?

Quartz has a hardness of 7 on the Mohs scale, making it resistant to scratching and suitable for jewelry and industrial applications.

Where are the largest quartz crystals in the world found?

The largest quartz crystals ever found come from Brazil, especially Minas Gerais. A 44-ton specimen was discovered in Capelinha.

Does clear quartz have any technological applications?

Yes, it is used in quartz oscillators to control frequencies in clocks, radios, and computers, as well as in piezoelectric sensors.