Gananite (simplified Chinese: 赣南矿; traditional Chinese: 贛南礦; pinyin: gànnánkuàng) is a rare bismuth fluoride mineral form of bismuth trifluoride with a general formula of BiF3. 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. Its color in plane-polarized light is blackish-brown, and it does not show pleochroism.
Hardness:
3.5
Density:
8.928 g/cm³
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Properties
Characteristics
Cultural
Common Questions
General Info About Gananite
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Physical Properties of Gananite
Colors
brown to black and greenish-black
Streak
Dark gray
Hardness
3.5 , Soft
Density
8.928 g/cm³, Obviously Heavy Weight
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Chemical Properties of Gananite
Formula
BiF3
Elements listed
Bi, F
Characteristics of Gananite
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Formation of Gananite
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.
Cultural Significance of Gananite
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Uses of Gananite
Despite the obscurity of gananite and its very limited use, it is sometimes used in China as a bismuth ore.
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