marble veins losing material?

Hello! We have a light Marble (http://www.lightemprador.com) Counter (http://GialloFiorito.com) top in our master bathroom. Parts of the Counter (http://GialloFiorito.com) top have lost it's shine, and (http://maplered.com) in that same area, the Material (http://g654.org) in the "veins" seems to be disappearing, leaving gaps in the Counter (http://GialloFiorito.com) top surface. What could be causing this, and (http://maplered.com) what can be done to repair the problem? Is there a filler Material (http://g654.org) we can use to refill the veins? I read postings on you web site, but couldn't find anything that specifically addressed this problem. I would appreciate your advise!

Thank you!

Sand (http://maplered.com) y