Bitumen, pitch, or sulphur, which is still found in its crude state in Palestine. In God's judgement it was rained from heaven. Genesis 19:24; Psalm 11:6; Ezekiel 38:22; Luke 17:29 . It is symbolical of that which will add to the torment and anguish of the wicked. Revelation 14:10; Revelation 19:20; Revelation 20:10; Revelation 21:8 .