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Cool red granite I have some of that. I didnt know there was another color besides gray.
Simmons, sandstone doesn't crumble just like that. It's a rock, after all.
You might just have hard packed sediments on your other sample. Some weathered concretions will also do that.
An example of granite:
http://i1209.photobucket.com/albums/cc389/Voltaire_Lapidary/bergarter069.jpg
Turkish,
Granite is a volcanic rock, not a sandstone.