Markascherite

Occurs in Pinal County.

Chemical Formula: Pb₄As₆Sb₂S₁₅

Specific Gravity: 5.7-5.8

Luster: Metallic

Hardness: 3.5-4

Markascherite is a lead arsenic sulfide mineral that often forms as silver-gray to black metallic crystals. It is found in hydrothermal ore deposits.

Next Pinal County mineral: Massicot