Yunnan Longling Xiaoheishan Area "yellow Series Chalcedony Gemstone Characteristics

As a newly discovered jade material,it is a fairly long period that Huanglong jade from discovery to gradually enter the market, from confusion to gradually known by people. The market eagerly needs a relatively comprehensive understanding of it.Moreover, in actual market transactions,this new kind of jade appears some certain problems which are worthy of further study and discussion. The name of Yunnan Longling Huanglong jade in market is ambiguous.Long time exist of part of finished products will discover the phenomenon of shallow.Based on this situation, this essay will give relatively detailed study and analysis of Huanglong jade's origin, color, gemology nature, quality evaluation and especially the current founding of fade phenomenon.And this essay will give Huanglong jade the support of commercial operation on a theoretical way; at the same time exploring some of the precious stones preliminary optimize materials methods.Longling Huanglong jade has various names,such as Huangla stone and Huangla jade, etc.and even the name of Huanglong jade is named by a businessman. The red-yellow jade produced in Longling which species are cryptocrystalline quartz quality jade, according to the local standard of Yunnan Longling concluded that it was chalcedony. But Huanglong jade also has structural features of similar agate banded structure.According to infrared spectroscopy and scanning electron microscopy to the observation of surface morphology, it found that Huanglong jade Massive accumulation of body which is completely different with colloidal structure of agate.Chalcedony structure is closer stacking structure, Huanglong jade structure is similar with that of chalcedony, but Huanglong jade structure is not as closer as chalcedony.So,it is scientific and reliable to name Huanglong jade as chalcedony.After certain experiment, this essay found that Huanglong jade shallow phenomenon has no related with its color element, and Huanglong jade inner structure also has not changed.That is to say, the phenomenon only related with the water of it.According to regional geology analysis of Longling district, finding that quartzite in this region was infiltrated by large number of rivers and ground water which cause Longling Huanglong jade contain water inside.Also,through infrared spectroscopy and found Yunnan Longling Huanglong jade exists substantial adsorbed water.Surface morphology by scanning electron microscope found that the structure of Huanglong jade is loose, and between particles have larger space. Adsorbed water on the particles exists in the gap.Huanglong jade's color variation only related with its absorbed water blowing out.The more blow out, the lager color change.Furthermore, experiment found that the grain (silica) of Huanglong jade more dense, the smaller color change.When Huanglong jade structure reach the degree of densification of chalcedony, its color will change little which can not see by naked eyes.The principle of bleaching is because of absorbed water exist in Huanglong jade, that lead to the energy reduction of reflection of light into the eyes of people which impact on the intensity of eye irritation, brightness reduced,color darken,deepen the color reflected in the macro. Conversely, when the adsorbed water to reduce or do not exist, the energy increasing of reflection of light into the eyes of people, that macro shallow reflected color.