As a traditional mineral medicine, Lapis Chloriti has attracted much attentions in recent years. Based on the components determined by the X-ray diffraction, the Lapis Chloriti were characterized by the terahertz time domain spectroscopy. Results show that the absorption of sample has positive correlation with concentration. The more mass with Lapis Chloriti, the more absorption. And the absorption becomes more intense with the particle size increasing. In addition, the absorption influenced by other factors are also compared and discussed.
The characteristics of Calamines has been firstly analyzed by terahertz time-domain spectroscopy. Results show that the main composition of the Calamine is calcite. And the terahertz absorption much relates with the particle size, sample thickness, as well as the proportion of polytetrafluorethylene mixed in the sample.
The absorption coefficient and refractive index of the tourmaline in different directions have been firstly characterized by the terahertz time-domain spectroscopy. Results show that the absorption and refractive index of terahertz are much related with the tourmaline structure. And the absorption along the optical axis direction is more sensitive than that of the vertical direction. Such a result indicates that the identification and characterization of crystals as well as minerals can be realized by the THz method.