Skip to content


Your cart is empty

Article: Sodalite


Structure and Properties of Sodalite

  • Sodalite's structure was first studied by Linus Pauling in 1930.
  • The structure consists of tetrahedra with silicon and aluminum atoms at the corners.
  • Oxygen atoms link between the SiO and AlO tetrahedra.
  • The structure contains six-membered and four-membered rings of tetrahedra.
  • Sodalite's structure can expand and uncrumple with increasing temperature.
  • Sodalite is a feldspathoid mineral named after its sodium content.
  • It is known for its blue color, but can also be grey, yellow, green, or pink.
  • Sodalite is often mottled with white veins or patches.
  • It is relatively hard but fragile and can be used in jewelry and various applications.
  • Sodalite exhibits fluorescence under ultraviolet light and may show tenebrescence.


  • Hackmanite is a variety of sodalite that exhibits tenebrescence.
  • It can change color from pale violet to greyish or greenish white.
  • Hackmanite from Afghanistan and Myanmar Republic turns violet to pink-red in sunlight.
  • Tenebrescence can be accelerated by ultraviolet light.
  • Hackmanite may also fluoresce orange under UV light.

Occurrence of Sodalite

  • Sodalite was first described in 1811 in West Greenland.
  • It is typically found as vein fillings in plutonic igneous rocks.
  • Sodalite is associated with minerals like leucite, cancrinite, and natrolite.
  • Significant deposits of fine material are found in Canada and the US.
  • Smaller deposits are found in South America, Portugal, Romania, Burma, and Russia.

History of Sodalite

  • The Caral culture traded for sodalite from the Collao altiplano.
  • Sodalite has been known since the early 19th century.
  • Its structure was studied by Linus Pauling in 1930.
  • Sodalite has been used in various cultural and historical contexts.
  • It continues to be valued for its beauty and unique properties.

Definition, Composition, and Synthesis of Sodalite

  • Sodalite is a mineral belonging to the sodalite group.
  • It is composed of sodium, aluminum, silicon, and oxygen.
  • The chemical formula of sodalite is Na8Al6Si6O24Cl2.
  • It has a cubic crystal system and a Mohs hardness of 5.5-6.
  • Sodalite is often blue in color, but it can also be found in other colors such as white, gray, or green.
  • Sodalite can be synthesized in the laboratory through hydrothermal processes.
  • The crystal structure of sodalite consists of cages formed by interconnected tetrahedra of silicon and aluminum.
  • These cages can accommodate various cations and anions, leading to the formation of different sodalite compositions.
  • Enclathrated sodalites, where guest molecules are trapped within the cages, have been successfully synthesized.
  • The crystal structure of sodalite is widely studied for its applications in materials science and catalysis.

Applications and Uses of Sodalite

  • Sodalite is commonly used as a gemstone and in jewelry making.
  • It is also used as a decorative stone in carvings, beads, and cabochons.
  • Sodalite is sometimes used as a substitute for lapis lazuli due to its similar blue color.
  • In industry, sodalite is utilized as a source of sodium and aluminum.
  • Its unique optical and fluorescence properties make it desirable for collectors and enthusiasts.

Sodalite Data Sources

Reference URL
Knowledge Graph

Read more


Composition and Types of Solder Solder is composed of tin and lead, with tin concentrations ranging from 5% to 70%. Lead mitigates tin whisker formation. Common alloys for electrical soldering incl...

Read more


General Sintering Sintering is a process of compacting and forming a solid mass of material by pressure or heat without melting it. It is used in manufacturing processes for metals, ceramics, plast...

Read more