Sodalite is a class of feldspar-like minerals that are chloride-containing sodium aluminosilicates. Sodalite includes hydroxysodalite, squarish stone, blue smectite, etc. The color of different kinds of sodalite is also different. In the volcanic eruption, the shadow of the sapphire stone is common, and its color is gray, brown, blue, and the like. Blue sapphire is white, gray, green, etc. in addition to blue. It is a common gemstone with output in France, Brazil, Greenland, Russia, Myanmar, Romania and North America.
The main recognition characteristics of sodalite: dark blue, polycrystalline structure, low RI1.48, low SG2.28 floating in 2.65 heavy liquid, reddened under Charles filter, magnified to observe the distribution of white matter In it. The color is close to that of lapis lazuli. The main difference is that lapis lazuli is a combination of minerals with pyrite particles and calcite in a star-like or clump-like distribution. Sodalite is a class of feldspar-like minerals that are chloride-containing sodium aluminosilicates.
Shape features:
Citing the Gemological Local Jade Research Report: Sodalite is usually blue, with a few white, green, red, purple or gray. Crystals are quite rare and are produced in the form of massive, granular or tuberculous forms in nature. Generally, it has a glass luster, and on the cleavage surface, it is a grease luster. Sodalite is a silicate mineral containing sodium, aluminum and chlorine. When nitric acid is added and silver nitrate is added, a white green silver precipitate is produced.
When chlorine is replaced by sulfur in the composition, sodalite is formed into a craterite (Hackmanite). Sodalite is rare in nature and its appearance is similar to that of lapis lazuli (Lazurite), so it is often used as a substitute for lapis in the gem market, but sodalite rarely contains lapis lazuli characteristics. Inclusion of pyrite.
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