Primitive Achondrites

Primitive achondrites are meteorites derived from small parent bodies (asteroids) that were heated to the point of melting and melt migration (in the time period ~4.567 to 4.557 billion years ago), but never experienced "large-scale" differentiation. Although the exact definition of primitive (as opposed to differentiated) achondrites is highly debated, a good rule of thumb is that primitive achondrite parent bodies never experienced core formation. I work on two main groups of primitive achondrites, ureilites and brachinites.