Identify Stone Please?

[Revosok]

I found this rock half buried in the ground when I went to Mexico (near Cancun). I was near the ocean at that time, but the location of it did seem a bit strange (it was about a quarter of a mile away from the beach). I polished it once I got home, and I believe that it is agate. It is about ~2 x 1/2 inches.
(sorry for the fish in the photo, my camera is dead and I already had a photo on my computer, so I just used it)

 

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[IAMZIM]

I have some banded calcite that looks almost exactly like that, but I will bet it is agate. Hard to tell from the pic.

 

[Revosok]

Interesting story. Just several seconds ago, I was looking up agates on the internet, and on the first page I saw a link for an old quarry in Connecticut. I clicked on it, and it turns out that it was in my county. I then clicked on the map, and it turns out that it is in my town. I then zoomed in and guess what, it turns out that it is walking distance from my house. I guess I have to visit it some time.

 

[Revosok]

My specimen does not have the small crystals that I saw in the pictures of banded calcite that I saw. The transition from one band to another is abrupt.

 

[Revosok]

Sorry for triple posting, but the only reason I have any doubt that this is an agate is because of its dark colors. After searching the internet, I was not able to find any agates with the colors: darkbrown/lightbrown/gray/white. So, based on this information can anyone confirm that this is an agate, or would you need better photos?

 

[Revosok]

Just found this, I don't think that odds are in my favor right now.

 

[DDancer]

Agates come in pretty much all colors. Calcites dont polish well so odds are its an agate. Agate and other silicate stones are pretty durable and can travel along way from their sources. Many beaches in the world have them as do many water ways and glacial deposits the trick is finding them.