Yuanfuliite, a new mineral named after Prof.Yuan Fuli (1893一1987)，was discovered in the Zhuanmiao boron deposit, Kuandian County, Liaoning Prowince. It is a borate mineral rich in such components as Mg, Fe3+，Al3+ and Ti4+.The mineral is black and has brownish black streak.It is nearly opaque with adamantine to submetallic luster. Reflection color light grey. Internal reflection dark reddish brown. Anisotropism weak. Pleochroism dark red to dark brown. Tiny prismatic crystals about O.1×0.2×l mm. Its crystallochemical formula is(Mg0.91Fe2+0.09)(Fe3+0.56 Al3+0.19 Mg0.17Ti0.11Fe2+0.10)1.13(B0.92O3.00). Space group Pnam; a=9.258(6)A，b=9.351(4)A，c=3.081(2)A，V=266.8(2)A，Z=4.D=3.80 g/cm3, H=5一6，VHN50=843 kg/mm2. Cleavage ｛100} perfect. Infrared absorption bands; 1387，1201，1029，951，733，600，510 and 908 cm-1. Mossbauer studies show that Fe3+ has occupied the M(1)，and Fe2+ the M(1)and M(2)respectively. Yuanfuliite is the Fe3+-dominant analogue of warwickite.