It was originally classified as a eucrite, a group of meteorites thought to be from the asteroid Vesta.
BBC: Mercury meteorite puzzle
2.
An Argentinian Pitt had never seen before showed up at his office door out of the blue, offering to sell Pitt a rare Eucrite meteorite weighing 3 pounds.
FORBES: They've Gotta Have It
3.
For hard-core hobbyists, that's not a problem, and may even be a point of pride: It takes a practiced eye to distinguish between a eucrite and a diogenite.