Since lapis lazuli has received more and more attention from consumers in recent years, the demand for identification and testing of lapis lazuli has increased year by year. In the market, there are also a very small number of unscrupulous merchants who use some other substances to pretend to be lapis lazuli. What are the imitations of lapis lazuli? How will imitation and "synthesis" be done?
In the market, the current imitation of lapis lazuli mainly includes sodalite, dyed marble, synthetic lapis lazuli, blue dongling stone, azurite and sapphire. Among them, sodalite and dyed marble have become the main imitation of lapis lazuli because of their similar appearance and relatively low cost. Appearances with similar appearances have emerged, and how to distinguish them has become a topic of concern to consumers. The lapis lazuli and its imitations should be distinguished mainly by its weight, transparency, inclusion and hardness.
For example, in the discrimination between lapis lazuli and sodalite, lapis lazuli is mostly granular and the color of sodalite is often plaque; lapis lazuli presents a certain gold color due to the inclusion of pyrite; Stones rarely see pyrite inclusions, and few golden substances appear.
In most natural lapis lazuli, the color distribution is not uniform, and the pyrite contour is irregular, appearing as small plaques or streaks; while the "synthetic" lapis lazuli color distribution and inclusion distribution are very uniform. In terms of density, natural lapis lazuli has a higher density, so the two are put together and the natural lapis lazuli is heavier. Compared with lapis lazuli, bluestone has the problems of low density and light weight.
The dyed marble imitation is relatively well recognized. The most obvious feature is that the dyed zone is mostly at the crack of the imitation and the boundary of the particle. The dye may fade after a period of time. Compared with the natural lapis lazuli, the hardness of the dyed marble is small. Can be scored by a knife.
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