Type of Amber from Myanmar and Its Gemmological Characteristic

In this paper, common ambers from Myanmar in Tengchong market, Yunnan Province, were chosen as the research objects.The gemmological characteristics, inclusion features and infrared spectra of ambers from Myanmar were tested and analyzed.The results showed that amber samples from Myanmar appeared the phenomena of anomalous extinction under the polariscope, and the specific gravity ranges from 1.020 to 1.050.However, the specific gravity of plant amber, blood amber and black amber is respectively 1.064, 1.084, 1.109, significantly larger than that of the other types.Most of amber samples from Myanmar generally release strong blue or blue purple fluorescence under long wave ultraviolet light, and weak fluorescence or none fluorescence under short wave ultraviolet light.Whereas, under long wave ultraviolet light, black tea amber shows purple pink fluorescence, and blood amber and black amber show khaki fluorescence.A wide range of inclusions existed in ambers from Myanmar, such as cracks, rhyotaxitic, gas-liquid two-phase inclusions.And the rhyotaxitic inclusions in ambers from Myanmar have a signification effect in identifieation of origin.The infrared spectrum test results demonstrate that the characteristic absorption peaks in infrared spectra of ambers from Myanmar are four main absorption peaks within 1 300～1 000 cm^-1.The intensity of absorption peak at 1 142 cm^-1 is the largest one, and the peak at 1 224 cm^-1 is the second largest one, and the intensity of absorption peak at 1 090 cm^-1 and 1 031 cm^-1 are weak.