Brimstone and salt
In Deuteronomy 29:33, this signifies the vastation of good and truth, for these destroy the earth and its produce as lusts destroy goods and falsities destroy truths. (Arcana Coelestia 1666)
Ezekiel 25:15-16
15
Thus says the Lord Yahweh: Because the Philistines have dealt by revenge, and have taken vengeance with despite of soul to destroy with perpetual enmity;
16
therefore thus says the Lord Yahweh, Behold, I will stretch out my hand on the Philistines, and I will cut off the Cherethites, and destroy the remnant of the sea coast.