Slimepedia Entry
Jellystone is a common resource obtained with a drill.
Jellystone is a semi-hardened mixture of minerals and slime, possibly resulting from plorts sinking back to into the earth below. Because of its solid texture, it's a favorite stone for sculptors.
On the Ranch:
Deposit jellystone into the Lab's refinery where it can be used for crafting Slime Science gadgets.