Hunan Xiang Hua Ling Nephrite Characteristics And Quality Of A Preliminary Study

Hetian jade is the jade eight thousand cultural inheritance and the development important matter,with the development of economy,the mining technology constantly updated,is no longer in xinjiang hetian jade's origin.Domestic except xinjiang mainly golmud in qinghai,liaoning xiuyan,guizhou luodian,Taiwan's Hualien and henan luoyang nephrite mineral deposits have been found.In May 2016,the XiangHuaLing area TangGuanPu area found suspected nephrite ore,appraised by experts on-site inspection and confirmed that a number of hetian jade output.TangGuanPu area is located in the hunan linwu XiangHuaLing and carbonate rock contact zone of granite,the mining area is mainly tin polymetallic deposit is given priority to,nephrite is accessory minerals in the mine.Through the fragrant flowers ridge pond shop work area of rock specimen observation and in combination with regional geological data and the analysis results of rock slice,nephrite deposits is primarily contact metasomatic type,granite and calcium magnesium carbonate formed by contact metasomatism,metasomatism early formed silicon card lithified diopside,garnet and other minerals,the late is formed the hydrous silicate minerals,such as tremolite and actinolite mineral,continued to replacement and minerals such as potassium feldspar,sodium feldspar,late skarn aerobic to contain beryllium silicate and a small amount of sulfur,and associated minerals are quartz and mica.Nephrite vein width of 0.5 meters to 0.5 meters,the average is about 1.5 meters wide,much as the blue and green,through thin section observation,fragrant flowers ridge nephrite more impurities,mainly quartz and some metal minerals,such as,arsenopyrite,pyrrhotite,etc.Are distributed in some directional tremolite arrangement,the transparency of such tremolite is better,but quartz particle impurity is more,less oily;Tremolite are arranged in a fibrous felt structure of non-stereospecific nephrite,transparency is not good but oily relatively well,because the second mining area is tin polymetallic deposit,nephrite common magnetic arsenopyrite and pyrite in the metal and mineral.According to the electron probe and X-ray fluorescence spectrum analysis of data,nephrite fe content to an average of 4.366%,significantly higher than that of xinjiang,qinghai sapphire fe content.In addition to the high iron content,and k,manganese,sodium,phosphorus,titanium,nickel,sulfur,chromium,aluminum and other impurity elements,and the percentage of these impurities content reaches3.318%,these embodies in nephrite fragrant flowers ridge leads to uneven color,often white vein,the massive impurities and some dark metal particles.According to the formula of Mg/(Mg + Fe2 +)concluded that fragrant hill has a value of 0.817,nephrite Shi Yu for Yang,this is the fragrant hill nephrite and the biggest difference between xinjiang and qinghai nephrite jade.