How many Orichalcums are there in Kingdom Hearts 2?

Answer 1

Orichalcum are unlimited, but can only be dynamically found as an item drop from the rare Bulky Vendor enemies.

Otherwise, they can be found (13):

By obtain a total of 1000 materials,

obtaining 45 different materials types,

in a chest at the Kanga's House,

in a chest at The Spooky Cave,

in a chest at the Throne Room,

in a chest at the Ship Graveyard: Seadrift Keep,

in a chest at the Underground Concourse,

in a chest at the Tunnelway,

in a chest at the Mansion: Library,

in a chest at the Fragment Crossing,

in a chest at the Nothing's Call,

in a chest at the Naught's Skyway,

in a chest at the Ruin and Creation's Passage.

Orichalcom+ are not unlimited and can only be found (7):

By obtaining all material types,

completing the Starry Hill Torn Page,

completing the "A New Day is Dawning" musical,

winning the Goddess of Fate Cup,

in a chest at the Central Computer Mesa,

in a chest at the Sunset Terrace,

in a chest at The Brink of Despair.