Deep Rock Galactic

Alright.

Around a 4% chance of spawning. I played for two weeks (normal haz 4 games, not trying to find them) and saw none.

How i got this fairly quickly is to run haz 1 simple mining expeditions on Salt pits, Radiation zone and the caverns. (easy to navigate) and speed run them. Should only be in a cave no longer then 10 minutes.(better if you have dark morkite, do them within 5min) I personally played as the driller so i can dig back to the pod fast and dig through the dirt fast as well.

Due to sheer probability i played around 120ish games doing this method(could be way less for you, i saw people get this in the first couple days. Or it can take way more then me). Didnt see any for a couple days, then got 4 within 3-4 hours. I find this is the most reliable way of farming for them. Don't mine anything else but the main objective(was also grinding for the solo games and host. This also works for the gold chunks, found 30-50 in one day)

They do spawn everywhere but i found 7/10 in the Crystalline Caverns. Sometimes right after the first dirt wall(can just leave after that and farm that way, found 2 or 3 right after the first dirt wall). i Found 1 in the salt pits joining a random game, 1 in the salts solo and one in the radiation zone. Soooooo im not saying im superstitious buuuuutttttt i feel like the caverns are the best bet. Was for me anyways, but again it all comes down to probability.

Good luck and Rock and Stone Brothers !