Oh, I know.

This helps: http://www.sanobike.com/dedacciai.htm (scroll down to SC61.10)

But this nails it:

http://www.dedacciai.com/products.asp?type=3&tid=22

Particularly when they call it out here:

http://www.dedacciai.com/products.asp?type=3&tid=15 (where "rare earths" = scandium)

Here too:

http://www.cyclingnews.com/tech/?id=...etters/march04

Scroll down to "Carbon Stays on Scandium Frames" - an interesting article in its own right.