Andalusite

Andalusite is a mineral used as a refractory material in furnaces, kilns, etc – it is extremely heat resistant.

High quality pieces are sometimes cut for jewellery usage. By far the best known type is called Chiastolite, a form of Andalusite with graphite inclusions forming a cross.

Showing all 1 result

Appearance, Uses and History

Andalusite is a mineral primarily used as a refractory material in furnaces, kilns, etc – it is extremely heat resistant.

A much loved variety of it is called Chiastolite, in which Graphite inclusions form an unusual cross shape. Andalusite is not often sold for jewellery usage, although some higher quality pieces are cut en cabochon or faceted.

Andalusite was named after Andalusia, Spain – where it was supposedly discovered. However, the person who named it was not particularly familiar with Spanish geography… turns out it was actually in Guadalajara. Guadalajite is probably a bit harder to pronounce.


Locales

Andalusite is found in Australia, Austria, Brazil, China, Czechia, Germany, Greece, Italy, Russia, Spain, and the USA.


Mineralogy

Chemistry
Aluminium neosilicate, with the formula AlSiO5.
Colours and Variations
Most commonly occurs in a brown colour, but can also occur in pink, violet, green, grey, white.
Streak
White
Luster
Vitreous
Fracture
Uneven
Crystal habit
Crystals with square cross sections, massive, or fibrous.
Mohs hardness
6.5 – 7.5
Specific Gravity
Easiest testing method
3.10 – 3.20
Common Treatments

Photos of Andalusite

AndalousiteTyrol
Andalusite - Al2SiO5 (38886403330)
Andalusite-57085

Andalusite23
Andalusite3
Andalusite37

Andalusite7
Andalusite-213173
Andalousite

Hazards and Warnings

Almost all rocks, minerals (and, frankly, almost all other substances on earth) can produce toxic dust when cutting, which can cause serious respiratory conditions including silicosis.

When cutting or polishing rocks, minerals, shells, etc, all work should be done wet to minimise the dust, and a suitable respirator or extraction system should be used.


Translations

Arabic:

Hindi:

Portuguese:

  • andaluzita

Bengali:

Indonesian:

Punjabi:

English:

Italian:

Russian:

French:

  • andalousite

Japanese:

  • アンダルサイト

Spanish:

  • andalucita

German:

  • Andalusit

Korean:

  • 안달 루 사이트

Thai:

Gujurati:

Mandarin and Traditional Chinese:

  • 红柱石

Urdu:


Further Reading / External Links