The chemical formula of mineral Aerugite is indicated by Ni9As3O14. Aerugite is found in the walls of furnaces used to roast ore. It is actually usually found at its type of locality at South Terres Mine, St. Austell, Cornwall, England. Aerugite was named for the Greek word for copper rust, an allusion to its appearance. Aerugite is known to crystallize in the trigonal-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.

            Aerugite is most commonly found in deep blue green to green color that could appear more splendid when evaluated with the aid of petrographic polarizing light microscope used in the field of optical mineralogy. The specific gravity measure of the mineral is usually ranging from 5.85 to 5.95 grams per cubic centimeters. Aerugite is usually found with encrustations, usually forming crust-like aggregates on matrix that appears more interesting under polarized microscopes. Its crystals are usually found euhedral form and mostly occurring as well-formed crystals showing good external form. Aerugite are also found in massive forms and usually uniformly indistinguishable crystals forming large masses. The hardness measure of the mineral when it is evaluated using the Mohs scale method is usually found 4. Aerugite is a non-magnetic mineral. It is usually found leaving a greenish white streak when rubbed on a white porcelain streak plate. Aerugite is a non-radioactive mineral.