Dwayne ‘The Rock’ Johnson has angered geology fans by refusing to confirm exactly what kind of rock he is.

The actor and former WWE wrestler has so far avoided answering any questions on whether he’s sedimentary, igneous or metamorphic.

‘This is a very basic geological question and yet this so-called “The Rock” refuses to answer it. What is he hiding? I think we have a right to know,’ said Mandy Roethlisberger, a professional in the field.

While The Rock has all the usual lumps and bumps one would associate with a rock, there are some rumblings that he might not even be a rock at all.

‘He’s just a muscular man. I’ve seen his long-form birth certificate,’ said Donald Trump.

We reached out to The Rock for a comment but his agent told us he was currently undergoing restoration work to repair some light weathering.