Certain drops only show up when you're voiding in that area. The more items you're voiding, the higher your chance of the rare drop.
Every Stone you find while exploring is a Stone that you pick up and try to fit in your pocket. Then you toss it away. It's the tossing that generates the new items. So when you toss a lot of Stone, maybe 1 in 20k is a ((geode)). You can hit rocks with a hammer all day long and not find one. So it has to happen when you least expect it!
Overflowing Antler? Maybe 1 in 5k turns into ((wooden knife)) when you toss it away. Can't figure out how to replicate the process in your workshop no matter how hard you try, it only seems to happen while exploring and your pockets are already full.
Super Rare: ((orange gecko tail)), because they discard it only when terrified and most of the time they're quite friendly with you.
(Nicho was paid in trout to submit this improvement)
