八三玉的特征及其鉴别

CHARACTERISTICS AND IDENTIFICATION OF BASAN JADE

八三玉是中缅边境地区常用的俗称，属商贸名称。八三玉问世以来，多数人认为八三玉的主要矿物成分为钠长石，定名为钠长石玉，八三玉是由主要矿物成分硬玉和少量闪石类、辉石类矿物组成的质粗水干的硬玉岩，属缅甸翡翠的一个新玉种。由于八三玉颗粒较粗，结构疏松，解理和微裂隙发育等特点，经优化处理后可提高透明度、加固结构、增强牢固性，在很大程度上改善其色泽和外观，从而提高了八三玉饰品的商业价值。通过对八三玉的光泽、颜色、折射率、密度、紫外荧光、结构特征、红外光谱分析等资料，可以与天然翡翠进行鉴别。八三玉作为缅甸翡翠的一个新玉种，其商贸名称仍可沿用，但在鉴定时应采用国家标准定名为翡翠（处理）。

Basan Jade is a popular commercial name in the boundary region between China and Bur ma. Since it comes out, most people have believed the main mineral of Basan Jade is albite,and named it Albite Jade. However, we believe it is a rough jadeitite composed of main miner al jadeit and a few amphibole, pyroxene, belonging to a new jade species of Burma feicui.The Basan Jade is characterized by coarse grain, limp structure and with a lot of joint and microfissure. By improvement process, increasing transparence, consolidating structure,strengthening firmness, greatly improving color and appearence, the commcrcial value of Basan Jade jewelry can be raised.The Basan Jade is distinguishable from the natural feicui by lustre, color, refractive in dex, density, ultraviolet fluorescence, texture feature, infrared spectroscopy.As a new species of Burma feicui, the commercial name Basan Jade is still applicable.However, it must be named feicui during identification according to the state criterion