Substitutes on mobile if you can’t find this (they’re nvr there when you need them)

Silica pearls- just pickup oysters! A bunch spawn around herb island.

Oil- get a pickax and head near the coasts of the snowy regions, go to town on the oily rocks!

Chitin- kill the small insects (either flying or on the ground) or get a gun, arrows, raptors etc. and go the cave (i prefer the south cave) and kill the spiders

Thank me later!!!