Yellow grape-like arsenic and lead ore limonite Minerals 1:12 PM A+ A- Print Email Yellow grape-like arsenic and lead ore limonite the students in the surrounding rock. Formula: AsSystem: TrigonalColour: Tin-white, tarnishing to ...Lustre: Metallic, DullHardness: 3½ From Mexico (San Pedro, Corralitos, Chihuahua, Mexico),