"Fresh, light colored aubrites (like Pena Blanca Spring, Cumberland Falls, and Norton County) have to be some of the rarest meteorites on the planet. I've noticed that most aubrite finds coming out of NWA are rusty and dark colored. Aubrites are so far out of chemical equilibrium with the environment at the Earth's surface that they must weather very rapidly." Carl Agee FB 6/7/2015
Friable as well.