Mineralogical Characteristics of Several Types of Representative Qingtian Stone

This paper attempts to explore the major mineral component，mineral combination and colour genesis of seven types of representative Qingtian stone（“Fengmenqing”“Jinyudong”“Huangjinyao”“Zhusha”“Shuicao”“Ziluolan”“Sancai”）by using X－ray powder diffraction，infrared spectrometer and LIBS.The results show that“Fengmenqing”and“Jinyudong”belong to pyrophyllite－type Qingtian stone.“Huangjinyao”belongs to illite－type Qingtian stone，whose mineral combination is illite with a small amount of pyrophyllite.“Zhusha”belongs to pyrophyllite－type Qingtian stone，whose mineral combination is pyrophyllite，quartz，hematite and kaolinite.“Ziluolan”belongs to pyrophyllite－type Qingtian stone，whose purple parts may be dumortierite.The major mineral component of“Sancai”is pyrophyllite，but the mineral combination of its parts of three colours（gray，yellowishbrown and yellowish－green）is different，and its grainy texture is mainly caused by the higher content and better crytallization of quartz.