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Gananite
Gananite is a rare bismuth fluoride mineral with a general formula of BiF3.〔(Mindat.org ) Accessed December 16th 2010〕 Gananite is an isotropic mineral, it belongs to the space group P43m. This means that Gananite does not show any colors in cross polarized light, because when polarized light passes through it, it does not split into two perpendicular rays. In other words, because Gananite is an isometric mineral, it does not exhibit double refraction. Moreover, this tells us that this mineral is not birefringent. 〔Jambor, J. L., Burke, E. A., Ercit, T. S., Grice, J. D. (1988) New mineral names. American Mineralogist, 73, 1492-1499.〕 Its color in Plane polarized light is blackish-brown, and it does not show pleochroism.
== Discovery and occurrence ==
It was first described in 1984 for an occurrence in the Laikeng Mining District, Gan County, Ganzhou Prefecture, Jiangxi Province, China.〔 The name is given for its occurrence in the Southern Ganzhou (Gannan) region of China.〔 In the Gannan occurrence, the only reported location, it occurs in quartz veins in association with wolframite, native bismuth, bismuthinite, pyrite and chalcopyrite.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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