Gananite

General
Category| Halide mineral
Formula
(repeating unit)| BiF3
Strunz classification| 3.AC.20
Crystal system| Cubic
Crystal class| Hextetrahedral (43m)
H-M symbol: (4 3m)
Space group| P43m
Identification
Color| Brown to black, greenish black
Crystal habit| Aggregates
Fracture| Uneven
Tenacity| Brittle
Mohs scale hardness| 3.5
|re|er}}| Resinous to semimetallic
Streak| Dark grey
Diaphaneity| Subtranslucent to Opaque
Specific gravity| 8.928 calculated
Optical properties| Isotropic
Birefringence| N/A
Pleochroism| Non-Pleochroic
References| [1][2]

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.[4] 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.[5] 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 .[4] The name is given for its occurrence in the Southern Ganzhou (Gannan) region of China.[1] In the Gannan occurrence, the only reported location, it occurs in quartz veins in association with wolframite, native bismuth, bismuthinite, pyrite and chalcopyrite.[1]

## Uses

Despite the obscurity of gananite and its very limited use, it is sometimes used in China as a bismuth ore.

## References

1. ↑ 1.0 1.1 1.2 "Gananite", Mineral Data Publishing, 2005, accessed 16 December 2010.
2. ↑ Gananite Mineral Data, accessed 16 December 2010.
3. ↑ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine 85 (3): 291–320. doi:10.1180/mgm.2021.43. Bibcode: 2021MinM...85..291W.
4. ↑ 4.0 4.1 Gananite, MinDat.org, accessed 16 December 2010.
5. ↑ Jambor, J. L., Burke, E. A., Ercit, T. S., Grice, J. D. (1988) New mineral names. American Mineralogist, 73, 1492-1499.

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