brenni-steinn

(brennu-steinn, brenna-steinn), m. brimstone, sulphur, Sks. 391; Icel. sulphur mentioned in the 12th and 13th centuries, Arna b. S., D. I., H. E., etc.; b. logi, a sulphur lowe or flame, Rb. 336; b. vatn, a sulphur well, Stj. 91; b. þefr, a smell of brimstone, id.