Study On The Indicative Characteristics Of Hetian Jade Pebble Identification

Hetian Jade Pebble is the nephrite which is separated out of the primary mineral deposit,and then transported by long-distance running water and long-term secondary action.This thesis discusses the indicative characteristics of Hetian Jade Pebble identification through conventional gemological tests,shape characteristics,surface characteristics,electron probe test,micro-infrared spectrometer test,and Raman spectrometer test.It is concluded from the shape characteristics study that Shanliao(primary deposit),Shanliushuiliao(secondary deposit)and Hetian Jade Pebble(which is also called “Ziliao”)can be distinguished according to the shape,roundness level and weathered epidermis thickness.There are 14 common types of Hetian Jade Pebble.The Hetian Jade Pebble's roundness level includes secondary rounded,rounded and well rounded.The thickness of the weathered epidermis varies from zero to several millimeters or even several centimeters.The roundness level of Shanliushuiliao is subangular.Shanliushuiliao has no weathered epidermis or thin weathered epidermis.The roundness level of Shanliao is obvious angular or angular.Shanliao has no weathered epidermis or extremely thin weathered epidermis.The indicative characteristics of the identification of the Hetian Jade Pebble obtained through the research of surface characteristics are: the appearance of "nail marks" on the surface of Hetian Jade Pebble;the secondary mineral with indicative meaning filling in the cracks of the Hetian Jade Pebble;the "sand hole" and “sweat pores” on the surface of Hetian Jade Pebble;the appearance of secondary color combinations of the Hetian Jade Pebble's colorful epidermis.Through electron probe,micro-infrared spectroscopy and Raman spectroscopy,the research is conducted on the main minerals and secondary minerals of the Hetian Jade Pebble,the following conclusions are obtained: the main constituent mineral of the Hetian Jade Pebble is tremolite;the infrared spectra of Shanliao's surface and Hetian Jade Pebble's surface are generally consistent,indicating that the mineral is tremolite;the superposition of chlorite and manganese-rich mineral is an indicative characteristic of Hetian Jade Pebblewith black epidermis;chlorite,quartz,colloidal apatite,secondary calcite,kaolinite and manganite are the indicative secondary minerals of the Hetian Jade Pebble,and the presence of more than a variety of secondary minerals on the surface or cracks of the Hetian Jade Pebble is the indicative feature of the identification of Hetian Jade Pebble.The identification method and quality evaluation of Hetian Jade Pebblel are discussed.Five steps of identification are summarized,and the influencing factors of Hetian Jade Pebblel quality evaluation are analyzed in detail.