It doesn't exist as a harvestable resource yet. I guess it's gonna happen in a future update. Until then, I'm using the Capitalism NPC Trader's Custom Buy/Sell Table to get the stuff done. That's at least what I recommend doing if you don't wanna use a lot of admin commands.

I considered doing the same as InSAnÊ× but decided not to install the Capitalism series to my server. Instead I added the meteor metal as a potential drop in some of my loot crates, since I already fully customized the drops on my server.