A boulder that mysteriously disappeared two weeks ago from a national forest in Arizona is back, leaving forest official perplexed about who took it and where it has been.

Prescott National Forest officials said a forest employee on patrol Friday noticed that the 1-ton boulder dubbed 'Wizard Rock' had been returned to a site along State Route 89 south of Prescott.

The much-admired boulder is black with streaks of white quartz running through it.

The treasured one-ton boulder went missing last month but was miraculously returned to the park this weekend

The boulder is so heavy it would have needed heavy machinery to left and transport it

District Ranger Sarah Clawson said forest officials were thrilled that the rock was returned and 'grateful that whoever took it was conscientious enough to give it back to the public'.

According to forest officials, it would have required heavy equipment to move the boulder.

Permits are required to gather and remove most forest products, including rocks, plants and trees.