The chemical composition of mineral Cacoxenite is indicated by the formula (Fe+++,Al)25(PO4)17O6(OH)12•75(H2O). Mineral Cacoxenite derived its name from the Greek word kakos, meaning “wrong” and xenos, meaning “guest.” Mineral Cacoxenite is known to crystallize in the hexagonal system of crystal formation. In optical mineralogy, the hexagonal system of crystallization comprises crystals having four axes. Three of which are positioned in a single plane with equal length and are symmetrically spaced. The fourth axis is found to be perpendicular to the other three axes.

Mineral Cacoxenite has no cleavage display even if it is evaluated more closely under polarizing microscope used in the field of optical mineralogy. Mineral Cacoxenite is most commonly found colored brownish yellow, green, yellow, golden yellow and red yellow in hand sample. The specific gravity measure of mineral Cacoxenite is usually found ranging from 2.3 to 3.4 grams per cubic centimeters giving an average of 2.84. Cacoxenite is usually found showing uneven fracture showing flat surface (not cleavage) fractured in an uneven pattern which can be found more commonly visible when viewed under polarizing microscope used in the field of optical mineralogy. The crystal habit of mineral Cacoxenite as described in the field of optical mineralogy usually includes acicular forms occuring as needle-like crystals. It can be also found radial where crystals radiate from a center without producing stellar forms. Soetimes it can be also found stellate occuring as spherical, radial aggregates radiating from a “star” like point. The hardness measure of mineral Cacoxenite is usually found ranging from 3 to 3.5. Cacoxenite is a non-fluorescent mineral as evaluated. It can be also found exhibiting silky luster when viewed in reflected light of polarized microscope used in the field of optical mineralogy. Cacoxenite is also commonly found leaving a yellow streak when rubbed on white porcelain streak plate. Mineral Cacoxenite is commonly found showing uniaxial positive figure when evaluated between crossed nicols of polarized microscopes. Cacoxeniteis is also showing birefringence ranging from 0.0600 to 0.0650. Cacoxenite is a non-radioactive mineral as evaluated.