Gananite reported in this paper is a new bismofluoride mineral found in the tungsten-bearing quartz veins with tungsten minerals-from Laikeng, Southern Jiangsi. Associated mineral are; bismuth, bismuthinite, pyrite, wolfra- mite, chalcopyrite and quartz. The mineral is present as aggregates (O.I5mm-0.076mm) of anhedrai grains of unequal size, with semi-metallic luster, color is brown to black and greenish black with a dark grey streak, traBSlucent, no cleavage, fracture one- veu, brittle. Ho =135-153kg/mm2 . Dcalc.=8.928g/cm3. Under reflected light, isotro- pic with grey reflection color in air and grey internal reflections. Reflectance values (in the air and oil):407nm (11.08)(4.21)，435nm(12.32) (10.07)，546nm (12.75)(11.08)，591nm (I2.92) (12.63)，621nm(12.96) (11.37)，647nm (I3.27) (11.49). Single crystal studies could not be carried out because no single crystal has been found. The X-ray powder diffraction data are essentially identical to the data for synthetic a-BiF3 given on J. C. P. D. S, card 11-10 and are indexed on a cubic cell with a=5.825(1)A，z= 4, The space group of synthetic material is p43m. The strongest lines in the pattern are; 3.37(10) (111)，2.91(7)(200)， 2.059(9)(220)，1.756(8)(ε11)，1.682(5)(222)，1.334(5)(331)，1.188(5)(422)。 The chemical constituents of Gananite are Bi=78.98%and F=20.40%, total 9 9.38%.These yield the chemical formula BiF3. The mineral is'named after its locality. Type material is deposited in Ge- ological Museum of China, Beijing.