I haven’t counted how many of each type I did and I’m offline now, but mine looks like this:

Day 1 - all in-zone CEs/Fates (8 hours in zone) - zero
Day 2 - same, but more CEs than Fates (about 8 hours again) - 5
Day 3 - about 5 hours in OC, exclusively CEs; took an hour break to try farming Shaaloani fates because I only need one more of that color - 3 from OC CEs only, nothing dropped in Shaaloani

So I have 2 of 3 different kinds, 1 each of two others, and I have yet to see Verdigris. Still need 10 more rocks.