I'm a self tought Brazil user and I am looking for a pebble material commonly known as
"chatahoochee". It is used around swimming pools etc. Can anyone help?
You'll find many, many textures in Google Images if you search for "pebble stone" or "epoxy stone". It really depends a little bit, though, on what you are using it for - if you just want something that looks good from a distance, I would probably experiment with some noise textures.
You may want to give the Arroway materials a try, they have recently added a 'gravel' package, and you can download lower resolution samples for free.