The jadeite often has black spots in the form of spots, spots, filaments and bands. These different forms of black may be caused by different reasons and there may be great differences in mineral composition. The black spots are often the remnants of chromite ore after being replaced by jadeite. The black spots are often amphibole clumps, the black silk is the small and medium-sized veins in the hornblende, and the black belt is the larger black silk.
Black spot
Black spots are the remnants and artifacts of chromite after being replaced by jadeite, which tends to be green under the transmission of strong light and tend to be black under reflected light. Black spots are generally scattered in isolation.
Black and black belt
The black silk and black belt in jade are caused by alkaline hornblende and omphacite. The role of alkaline hornblende must also be treated in different ways. If the green-based jade contains black hornblende, these black or dark minerals have an adverse effect on the appearance of jadeite and should be treated as a clarity feature. However, if the dark color mineral is contained in the colorless or white-based jadeite product, it will not have a negative impact on the appearance of the jadeite, but will increase the value of the jadeite product. At this time, these dark-colored ribbons are not regarded as a clarity characteristic. It is treated as a color element.
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