I found some woohooium in my sims inventory after returning from a trip to China one time. Unfortunately I sold it not knowing how rare it is or how hard it would be to get any more.
I only noticed it in my inventory after returning from my trip so I don't know exactly how my same came to be in possession of it. Although I can say none of my sims have ever yet done any mining, or sculpting or rummaging through garbage cans.
I noticed a post earlier in this thread that said metals and gems cannot be found in the wild. My collection helper would strongly dissagree with this claim. They most certainly can be found in the wild and in abundance. I just had a sim spend two days straight with Testingcheatsenabled on and needs set to static, teleporting from spawn point to spawn point gathering up every gem, lump of metal ore and space rock there was. and the next full week picking up everything that respawned. My trip length was 18 days but I gave up after that because it was just getting very boring picking up everything that respawned with no woohoium.
My previous sim that had it must have come across it some where. Didn't find any at the relic vendor. I'm wondering if it can spawn in the treasure chests in the tombs or maybe even from excavating dig sites.
The only thing I'm certain of is that neither mining nor sculpting are required as none of my sims have ever done either.
I went through this thread to see where you saw a post about metals and gems not being found in the wild. (Next time, quoting it would be good.) I think you misunderstood what the poster was saying. She wasn't saying that all metals and gems cannot be found in the wild, just the woohooium and flourite that we're discussing on this thread.
About mining and sculpting, we're not saying they're required to find these items, just that a sculptor without the Savvy Sculptor trait will sometimes get one or the other when a sculpture fails and breaks. And that these items can also be found mining.
As for your woohooium, it may have come from excavating a site while on vacation. It can slip in without you realizing it like that.