I reckon this is a THHGTTG "Thumb" in disguise. Anyway, the next card has something that is ABSTRACT but could be argued to be MINERAL. If you look over there, you can see Nadine Dorries performing a mime of the subject in a monokini, as the Mystery Voice announces the answer to the audience.

[Ros,Bis] Bravo!

[Tuj] No. We are p-empty.
[Rosie] Not stoning of any kind.
[Chalky] No Midas touch here.
[Raak] Not a rock of any kind, nor a roll.