Larderite is a precious material for sealing and carving. Having found some specimens similar to larderite in lots of larderite carving and ornament markets, the authors tested their refractive index, specific gravity and Mohs' hardness and examined their U-V fluorescence and characteristics under microscope and in hydrochloric acid. Nevertheless, the data obtained are not convincing enough to determine the mineral names of the specimens. Assisted by infrared spectra (strong and keen peaks at 3698 cm-1, wide bands in 3500～3400 cm-1 mean stretching vibration of—OH，the peaks at 560 cm-1 and 451 cm-1), the authors identified the specimens as brucite. The energy dispersion X ray fluorescence spectra (EDXRF) have also verified the conclusion.