Distinguish lapis lazuli from similar jade. There are sodalite, periclase and kyanite that are easily confused with lapis lazuli. Fakes and substitutes posing as lapis lazuli include colored jasper, colored spinel, colored jadeite, imitation lapis lazuli, dyed marble and so on. Similar jade features are as follows:
Sodalite, translucent, coarse-grained structure, uniform color, visible initial cleavage and white calcite minerals. The hardness is 5.5-6, the density is 2.25, the refractive index is 1.483, and it is reddish brown under the color filter.
Blue square Shi Ying, orange-red fluorescence, density 2.44-2.5g/cm3, refractive index 1.49- 1.504.
The hardness of chalcopyrite is low, 3.5-4, and the refractive index is 1.73- 1.83. It is fragile and has no large compact blocks.
Colored jasper (also known as Swiss blue gold) is artificially colored with fake materials such as chalcedony, with hardness as high as 6.5-7 and refractive index of 1.54- 1.55.
Color spinel (also known as color kyanite) is artificially colored with cobalt salt, which has a granular structure, strong luster and uniform color. The refractive index is 1.72- 1.73, and the absorption spectrum of cobalt can be seen under the spectroscope, which is bright red under the Charles filter.
Colored jadeite (also known as stoneware blue gold) is light blue, free of pyrite, with strong grease luster, hardness of 2.5-6 and refractive index of 1.56- 1.57.
Kyanite-like gold can be imitated with glass. It is made of colored dark blue sulfur or glass, and pyrite is not visible. The glass is shiny, conchoidal fracture and fragile.
Dyed marble, low hardness, easy to carve with a knife, particle structure, obvious reaction in hydrochloric acid.
Colored jasper and glass containing copper inclusions often appear in imitation jewelry market to imitate lapis lazuli. The composition of synthetic lapis lazuli made by Frenchman gilson is very similar to that of natural products.
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