Sodalite from Angola a complex aluminosilcate

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Description

Sodalite a complex aluminosilcate of sodium with chlorine, is a light, relatively hard yet fragile mineral well known for its blue color, is named after its sodium content; in mineralogy it may be classed as a feldspathoid.

Mineral Group  silicate
Composition  Na8Cl2(AlSiO4)6
Origin  Angola
dimension (cm)  4x3x2
weight (g)  28
Sodalite has been known since early times but it was defined as a distinct mineral only in 1811 by the British mineralogist, T. Thomson. It was Discovered in 1811 in the Ilimaussaq intrusive complex in Greenland, sodalite did not become important as an ornamental stone until 1891 when vast deposits of fine material were discovered in Ontario, Canada.
It is a rich royal blue tectosilicate mineral widely used as an ornamental gemstone. Although massive samples are opaque, crystals are usually transparent to translucent. sometimes referred to as “poor man’s lapis” due to its similar color and the fact that is much less expensive. Its name comes from its high sodium content.Discovered in 1811 in the Ilimaussaq intrusive complex in Greenland, sodalite did not become important as an ornamental stone until 1891 when vast deposits of fine material were discovered in Ontario, Canada.see minerals.net

Additional information

Weight 28 g
Dimensions 4 x 3 x 2 cm