摘要
This paper discusses nephrite jade with high market value and production potential from the Chinese city of Hechi, in Guangxi Province.Three samples were tested by standard gemological methods, polarizing microscopy, environmental scanning electron microscopy (ESEM), X-ray diffraction (XRD), Raman spectroscopy, and energy-dispersive spectrometry (EDS), among other techniques.The samples were mainly white and gray-white (with areas of gray, gray-green, dark green, and black) and had a greasy to waxy luster.Within each of these color varieties, the samples had either" band" or dendritic patterns.The band pattern, composed of tremolite, varied in shape and was either transparent or opaque.Its color, transparency, and distribution were different from the unpatterned area of the nephrite sample.The dendritic patterns, which had a brownish yellow and dark brown to black color, were composed of chlorite that formed during metamorphism.
