Curiosity arrived on Mars two months ago to learn if the most Earth-like planet in the solar system was suitable for microbial life.
Last month, Curiosity's laser was used to zap the football-sized rock and the rover analyzed the pulverized material, as well as tiny pits left behind, to determine its chemical composition.
Magma inside a planet can undergo a similar process.
"You melt the interior and it comes to the surface and, just like the applejack, when you cool it, it crystallizes," Stolper said, adding that it takes very particular conditions on Earth to produce this type of magma.
The rover meanwhile has moved on to testing and cleaning of its soil scoop. Eventually, scientists want to funnel soil samples to Curiosity's onboard laboratory for more extensive chemical analysis.