The marble top of my bathroom sink is marble and the shiny sealer
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http://allsurfacerenew.com/sink-and-cultured-marble/
Big box stores sell sealer for marble and granite, you probably only need to reseal it
If it needs a major renovation: http://homeguides.sfgate.com/make-marble-top-shiny-90984.html
If you simply need to touch up the shiny parts, Lundmark and Rejuvenate make marble restorers which add a shine to your marble.
Is it actually marble or is it cultured marble? Marble turns dull when etched. Cultured marble has a coating that can peel and you can actually feel where the coating has peeled off. An etching repair kit will work on marble. For the sealer wearing off cultured marble you should contact a professional.
Real marble or cultured marble?
Marble.... https://www.youtube.com/watch?v=MPCGppeLX6k
Cultured Marble.... https://www.youtube.com/watch?v=dva6ksHtrsI