The Cobalt Petrified Wood is an item found in Red Dead Redemption 2. It is a rare item, and it is required to make the Boar Tusk Talisman.
Description[]
"A greenish and blue colored piece of petrified wood. Used to craft a unique item at the Fence."
Location[]
The item can be found in a chest on a cart, which is situated under an overhang near Lake Isabella in the Grizzlies West region of the Ambarino territory.