芒果视频下载

和田(tian)(tian)玉，“中國四大名玉”之一（其(qi)三(san)為陜西藍田(tian)(tian)玉、遼寧岫玉和河南獨(du)山玉）。和田(tian)(tian)玉雖然因新疆和田(tian)(tian)而命(ming)名，但其(qi)本身不(bu)是(shi)地域概念，并非特指(zhi)新疆和田(tian)(tian)地區出產的玉，而是(shi)一類產品的名稱。中國把(ba)透閃(shan)(shan)(shan)石(shi)成份占(zhan)98%以上的石(shi)頭都命(ming)名為和田(tian)(tian)玉，都在(zai)國標范(fan)圍內。其(qi)主要成分(fen)是(shi)角(jiao)(jiao)閃(shan)(shan)(shan)石(shi)族單斜角(jiao)(jiao)閃(shan)(shan)(shan)石(shi)晶(jing)系之透閃(shan)(shan)(shan)石(shi)，透閃(shan)(shan)(shan)石(shi)含(han)量越高(gao)，質量越好。