Rita frowns. That's somewhat typical for people who use magic as an innate power, rather than a learned one... but it's still frustrating, as a scholar, to find so many people with such little understanding of their own powers on a scientific level.

"What do you use it for?" she asks, slipping the fused rock into one of the large pockets of her tunic. "I'm assuming you don't just smash rocks together all the time."

Such an ability could probably be used in a wide variety of ways, depending on how creative the user is.