Yes. Plus evidence of a high water content interior.
News Release Number: STScI-2005-27
Largest Asteroid May Be 'Mini Planet' with Water Ice.
http://hubblesite.org/newscenter/archive/releases/2005/27/text/
Bob Clark
Space/Science » in reply to doesn't phylosillicates mean clays? What's up with that - evidence of a watery past?
News Release Number: STScI-2005-27
Largest Asteroid May Be 'Mini Planet' with Water Ice.
http://hubblesite.org/newscenter/archive/releases/2005/27/text/
Bob Clark