Help me identify my stone

I have some stones i was given but i have no idea what they are, does anyone have some suggestions?
please pardon my dirty ole nails i been making n bakin today :p

http://malevolentme13.tumblr.com/

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It looks like some form of agate, perhaps banded agate, or possibly chalcedony.

Here's a picture of chalcedony: http://www.mindat.org/photo-25528.html

And of a picture of some banded agate: http://upload.wikimedia.org/wikipedia/commons/6/6c/Agate_banded_750pix.jpg