The Tianhuang stone from Shoushan in China was studied by using slice observation, SEM, EDS, micro-Raman spectra, LA-ICP-MS, total iron analysis and EPR with the purpose of investigating the Luobowen and color genesis of Tianhuang stone. Under close magnification, no obvious regular boundary exists between matrix and Luobowen which diffuses around. SEM, EDS and micro-Raman spectral analysis show that svanbergite is the main mineral composition of the Luobowen. Svanbergite was formed before the formation of the matrix. Luobowen shows primary characteristics. LA-ICP-MS and total iron analysis indicate that Fe³⁺ causes yellow color, and EPR studies show that iron exists in the Tianhuang stone in the free state. The authors hold that iron oxides and/or iron hydroxides are adsorbed at the surface of layered silicate mineral grains, leading to secondary color.