Objective The structure and composition of Shoushan tianhuang were determined, and in order to understand the reason why field-yellow stone is different from other varieties of koreite. Methods It’s structure was observed by microscope and scanning electron microscope, and it’s chemical composition was analyzed by near infrared spectrometer, X-ray powder diffractometer and ICP-MS. Results By scanning electron microscopy, it was found that the crystal structure of fShoushan tianhuang is aphanocrystalline, the crystal is lamellar, the particle size is uneven, the overall orientation is poor, there is idiomorphic or hemidiomorphic pyrite and the particle boundary is clear. Comparing and analyzing the data, it is found that$\mathrm{{Cr}}$element is stable and there are three kinds of mineral composition in Shoushan tianhuang: illite is the main mineral. The main mineral is the dickite and the secondary mineral is the illite. The main minerals are dickite and kaolinite. Conclusion The analysis of structure and chemical composition of Shoushan tianhuang is of great value for identifying varieties of koreite and distinguishing different mining areas, and also provides important data support for understanding the production state and particularity of Shoushan tianhuang.

koreite  /  tianhuang  /  scanning electron microscope  /  near infrared detection analysis  /  X-ray powder crystal diffraction analysis  /  ICP-MS  /  illite