Fairday's Riddle: To Be Found...

Hello, Riddlers! Can you guess our theme?—bonus points if you can also guess the type of poem. More word play. 😀~ F

Gold in mind on hand.
Exciting to find the loot.
Mark the spot with X. 

What am I referring to? Stop by Friday for the answer.
Bonus points if you can guess the type of poem

The picture is the clue! (the answer is in this picture)