https://nedbatchelder.com/blog/200402/risks_inherent_in_the_rock_abrasion_tool
Risks inherent in the rock abrasion tool | Ned Batchelder
Feb 11, 2004 - Spirit successfully used the RAT (rock abrasion tool) to expose the internals of a rock on Mars. Apparently, though, it is not a risk-free procedure.
in therisksinherentrockabrasion