Silicon dioxide (SiO₂)

Silicon dioxide (SiO₂)

A polymorphic compound, mostly found in the form of quartz.

Chemistry

Keywords

silicon dioxide, quartz, sand, covalent network structure, gemstone, Quartz crystal, Amethyst, Flint, Agate, asbestos, glass, Glass manufacture, inorganic chemistry, chemistry

Related items

Scenes

Silicon dioxide SiO₂

Information

Melting point: 1,703 °C (3,097.4 °F)

Boiling point: 2,230 °C (4,046 °F)

Density: 2.26 g/cm³ (0.0816 lb/in³)

Hardness: 7 (on the Mohs scale of mineral hardness)

Properties

Silicon dioxide exists in several varieties, all of which have diamond-like crystal structures. It occurs in the form of quartz in the largest volume. Quartz crystals are colorless, but small amounts of impurities color them. Quartz crystals are optically active.

Silicon dioxide is a very resistant substance; it does not dissolve in water, hydrochloric acid, sulfuric acid or other mineral acids. It breaks down in hydrofluoric acid (a solution of hydrogen fluoride in water). It dissolves well in hot bases and alkali hydroxides.

Occurrence and production

It occurs in large quantities in gneiss, mica slate, quartzite, sedimentary rocks and seams. Several varieties of quartz are considered gemstones, for example rock crystal, amethyst, chrysoprase, opal and jasper.

Uses

Silicon dioxide is used as an abrasive in the leather, wood, rubber, aluminium and steel industries. It is a raw material in the production of glass and ceramics. Due to its thermoluminescence it is also used to determine the age of ceramics.

Related items

Silicon

A crystalline substance, an extremely important material in the electronics industry (semiconductors, integrated circuits).

Printed circuit board

This animation demonstrates the structure of small, mass-produced circuit boards.

Desktop computer

This animation demonstrates the structure and most important peripherals of desktop computers.

Laptop computer, peripherals

A variety of peripherals can be used with laptop computers.

Diamond

Crystalline allotrope of elemental carbon, the hardest known natural substance.

Fullerene (C₆₀)

A crystalline allotrope of carbon which was discovered at the end of the 1980s.

Graphite

One of the crystalline allotropes of elemental carbon.

How does it work? - Computer networks

The Internet allows us to send data quickly to large distances.

Phosphorus pentoxide (P₂O₅)

A compound formed as white smoke during the combustion of phosphorus.

Added to your cart.