In reading about the analysis of the rock Jake that Curiosity test, I ran into a lot of complicates language. Had to put my head out the window and scream type of language.
Basically, the rock Jake and the rocks called feldspar are quite a bit alike. Feldspar is from magma, which comes from volcanoes. The type of feldspar, and there are a ton of types, is called igneous.
Igneous is a form of crystallized rock from magma and from there, you are on your own.
Curiosity also scooped a bit of soil and ran it through the hopper. No results on what is in the soil yet.
A map of the world, this one, where feldspar is found.
By, Anwar saadat, English Wikipedia
A NASA diagram of Curiosity.
A picture that NASA made to show where they tested Jake.