"Jeffrey St. Clair, Ph.D." wrote in
message ...
Are you sure it isn't slate? They look pretty similar as they're
geologically related. I do better with pictures so I thought I'd share
one that has a slate plate (lol) in the tank.

http://www.flickr.com/photos/ifnar/1...7601124618440/
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Nope. It doesn't look like that at all. It's thinner and comes in what
looks like flakes with sometimes sharp edges. That looks like the limestone
we have right here on my property.
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RM....
Zone 6. Middle TN USA
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