Not sure Craig.
I bought them from Galactic Stone.
http://www.galactic-stone.com/
There may be more details if you dig into his website.
Careful though, his shopping cart has well oiled wheels and it's very hard to say no to some very nice samples.
My little bits of Vesta cost less than $10.
My tiny granules of Mars though, oh boy. But it's worth it to be able to say that I've actually touched Mars.
