The chemical formula of mineral Sartorite is indicated by the formula Pb3As4S9 or Lead Arsenic Sulfide. Sartorite is a Sulfide mineral. Sartorite is only used as a mineral specimen. Sartorite is only one of the rare sulfide minerals from the famous quarry at Lengenbach, Switzerland. It has been found that most minerals found in this quarry are arsenic sulfides and sulfosalts like Sartorite. Mineral Sartorite is usually found in steel gray color showing nice luster in reflected light of polarizing microscopes used in the field of optical mineralogy. Sartorite is most commonly found showing striated acicular to prismatic crystals embedded in a dolomitic marble. This rare sulfide mineral is only found at Lengenbach, Switzerland.

             Sartorite is most commonly found steel gray, lead gray to black color when viewed under polarizing light microscope used in optical mineralogy. Sartorite is most commonly found showing metallic luster when viewed in reflected light of polarized microscopes. Most crystals of mineral Sartorite are found opaque in appearance. Sartorite 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. The crystal habit of mineral Sartorite as described in the field of optical mineralogy usually include acicular to prismatic deeply grooved or striated crystals with a steep pinacoidal face, all of which can be noticed more clearly when viewed with the aid of polarizing microscopes for mineralogists. Sartorite can be also found as massive and granular in form. Sartorite is usually found showing good cleavage in one direction when viewed closely with the aid of petrographic polarizing microscope. It also exhibits conchoidal fracture when viewed under polarized microscopes used in optical mineralogy. The hardness measure of mineral Sartorite when it is evaluated using the Mohs scale method of petrographic polarizing microscope. Sartorite is also most commonly found leaving a dark brown streak when rubbed on a white porcelain streak plate. The specific gravity measure of mineral Sartorite is usually found 5.1 grams per cubic centimeters, which is slightly heavier than average for metallic minerals. Sartorite is usually found associated with realgar, dolomite and baumhauerite. The best field indicators of mineral Sartorite usually include crystal habit, density, locality, cleavage, association, lack of internal reflections, and grooves and striations. Sartorite has limited occurrence at its type of locality at Lengenbach Quarry, Valais, Switzerland.