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[<eureka AT hctc.net>]

Oops--Obviously I'm confusing tuff with tufa (I'm a 
botanist, not a geologist). I've seen volcanic (tuff) rock 
in my travels in New Mexico that fits the lightweight and 
color description of your rock. Looks like tufa is more 
related to travertine and karst and is found in the 
Missouri Ozarks, but I don't know that it matches your 
description. Let us know if you discover what it is.

--Sage
Way Out in Texas

On Mon, 12 Nov 2007 06:11:05 -0600
 Gene GeRue <genegerue AT ruralize.com> wrote:
> Wikipedia states:
> "Tufa is the name for an unusual geological form of 
> calcite rock.
>
> "Tufa is a rough, thick, rock-like calcium carbonate 
> deposit that  
> forms by precipitation from bodies of water with a high 
> dissolved  
> calcium content. Tufa is not to be confused with tuff 
> which is  
> volcanic."
>
> I know of no igneous rock here; everything is 
> sedimentary. But I  
> guess it could be tufa.
>
> On Nov 11, 2007, at 7:09 PM, <eureka AT hctc.net> 
> <eureka AT hctc.net> wrote:
>
> > Gene,
> >
> > Could it be volcanic tufa?
>
>
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