What happens when an anti-mineral is the third highest level of mineral in a stratum? Wegner says it "disrupts" construction, but I've never seen it actually happen.
Anti-minerals?
A different stratum is made. It's currently thought that it's pre-determined according to which stratum+antimineral was in effect.
There was a thread somewhere, compiling the different "backup strata." I don't remember where it was though.
When there's enough of an anti-material for one stratum to be the highest mineral, it becomes a different stratum entirely because now there's a different top two minerals and a new anti-mineral.
They're bad at explaining. Just.. smile and nod.
...No, the Anti-mineral changes the stratum when it's in 3rd place behind the two stratum-defining minerals. Changing the stratum by regular minerals works too. This morning the rightmost gate changed from Undead (Light+Dark) to Slime (Green+Light) when my brother added enough green minerals to overtake the dark ones for second place.
If blue ones were third place, it would have changed from Undead to... whatever the Anti-Undead stratum is.
EDIT: Found it! The list is here. (Note that Strata 2 and 5 of Onyx Queen were Alloy'd by the GMs to prevent an all-Slime gate. That's why they're inconsistent.)
Now that I look, the Anti-Mineral seems to "steal" second-place. Green + Yellow is Slime, but Green > Yellow >Red is Beast (Which would be Green + Red).
Purple + Green is Poison (Anti: Yellow), but [Purple > Green > Yellow] is Undead (Purple + Yellow).
TLDR: Mineral1 + Mineral2 + Anti = Stratum for Mineral1 + Anti.
A random stratum is made.. I think..