srilankagems.com
Welcome to thesrilankagems.com ...You can learn Gemology and more about Gemstones in the Earth

Home

Sodalite:

Crystal Structure
Composition
Lustre
Hardness
Birefringence
(DR)
Refractive Index (RI)
Specific Gravity (SG)
Cubic
Sodium Aluminium Silicate 3NaAlSiO4NaCl
Vitreous to greasy
5 1/2
None
1.50 (mean)
2.40
Name reflects with its sodium content is formed all shades of blue, with the rock lapis lazuli. Unlike lapis lazuli sodalite very rarely contains brassy pyrite specks. Specific gravity is low and contains white streaks of calcite. It can be carved for jewelry.
Found as masses in igneous rocks. Crystals are very rare but twelve- sided crystals have been found in the lavas of the volcano Vesuvius in Italy. They are too small to be used in jewelry. Brazil, Canada, Namibia India and the USA are the other sources.
Sodalite from Bancroft in Canada sometimes called princess blue because it was discovered during a royal visit by princess Margaret of England.
When cutting and polishing, this gemstone can be cut as cabochon and cameo.

 

 

 

 

 

 

 

Back to Top

┬ęCopyrights 2009 thesrilankagems.com All rights reserved.