02-06-2021, 09:10 PM
I think there would be a lot of planets, especially around white dwarfs, that have had their previous atmospheres and surfaces eroded and replaced by material ejected from the star when it left the Main Sequence. In the EWoCS classification these planets would be classified as Ragnorokian, I think. According to that table, Ragnarokian planets might be rich in carbon, nitrogen, lead, mercury, barium molybdenum and a bunch of other interesting elements.