Oobsidian

"Oobsidian (Resource); "Rare mystery pebbles throughout Oob. Thought to be a hardened byproduct created by gleamy Ooblets.""

Oobsidian has many uses making it a very valuable material worth keeping.

Obtaining
Oobsidian generates rarely on the beach in Badgetown, but can also be made by Gleamy Ooblets, or Gleamies. It can also obtained from the sea dangle with a super bait.

Oobsidian can be bought (wished) from the wishywell for 100 wishies.

Oobsidian can be rarely obtained from breaking rocks.

Uses
Oobsidian is used in many Tinstle Tasks, Usually only one.

One oobsidian is used in any Oobcoop upgrade!

Oobsidian is also used in many other recipes, Too hard to list here.