I want to know the characteristics of Xiuyu. classify

Generally divided into three categories. One is old jade: the seed material in old jade is Hetian jade, which belongs to tremolite jade. Its texture is simple and dignified, and its color is yellowish and white. This is a precious original stone. Good old jade can rival Hetian jade. The other is Xiuyan jasper, which belongs to serpentine mineral. Its texture is solid and moist, delicate and round, mostly green to lake green. Among them, dark green, transparent and few flaws are treasures, but because of the large output, they are not so precious. There is another kind called Cui Jia, which is a mixture of serpentine jade and tremolite jade. According to the color, there are dark green, green, light green, yellow-green, grayish green, tan, brown, dark red, sallow, white, yellowish white, greenish white and grayish black.