Tags: Chemical Substance, Mineral.
Gananite is a rare bismuth fluoride mineral 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.