There has not been a video game that I have worked on that didn’t need rock sound effects. Whether it was stuff blowing up, melee impacts, giant footsteps, or castles crumbling, I was always looking for tons of rock source recordings.
I started recording rocks in 1993 with a portable Panasonic SV-255 DAT recorder at 16-Bit 48kHz. By the end of the decade, I had acquired hundreds of rock and dirt material recordings. It was a good thing too, because they came in very handy for my video game sound design. You can hear some of them on major CD libraries.