The chemical formula of mineral Bahianite is indicated by Al5Sb+++++3O14(OH)2. This mineral is usually found in potholes as stream-worn pebbles and as residual concentrates above weathered volcanic rock. Mineral Bahianite is most commonly found at its type of locality about eight km southeast of the village of Paramirim das Crioulas, and elsewhere in the region around Rio do Picos das Almas, Serra das Almas, south-central Bahia, Brazil. Mineral Bahianite was named for the locality. Mineral Bahianite is known to crystallize in the monoclinic system of crystal formation. In optical mineralogy, the monoclinic system of crystal formation comprises crystals having three axes of unequal lengths. Two of which are usually found in a position that is oblique or not perpendicular to one another. However, both of which are commonly found perpendicular to the third axis.

Mineral Bahianite is most commonly found showing perfect cleavage in one direction which can be found more clearly visible when viewed closely under polarized microscope used in the field of optical mineralogy. Mineral Bahianite is most commonly found colorless, violet, cream white, light brown in hand sample. The specific gravity measure of mineral Bahianite is usually found ranging from 4.89 to 5.46 grams per cubic centimeters, giving an average of about 5.17. Most crystals of mineral Bahianite are found transparent in appearance. The hardness measure of mineral Bahianite when it is evaluated using the Mohs scale method is usually found 9. Mineral Bahianite is commonly found exhibiting adamantine luster in reflected light of polarized microscope for mineralogists. It is also most commonly found leaving a white streak when rubbed on a white porcelain streak plate. Bahianite is most commonly found showing biaxial negative figure when evaluated closely under polarizing microscope. Mineral Bahianite is also showing a 0.1100 birefringence when evaluated under optical mineralogy microscope. Mineral Bahianite is a non-radioactive species as evaluated.