Re: Tuffa vs Approvechite

[Harmon Seaver <hseaver@cybershamanix.com>]

   Seems like tufa would be something that could be ground up and then
"recreated" on site in molds. 

 "Tufa is formed when water evaporates from lime-rich waters, leaving calcite
(calcium carbonate) to crystallize, often with impurities of iron oxides (rust),
which give tufa its yellow and red coloration."
 "Tufa is formed on cliffs, caves and quarry faces where limestone is naturally
occurring. This rock can form very quickly if conditions are favourable. Plants,
mosses and invertebrates often become encrusted in the calcite, and preserved as
fossils."

http://www.tufa.bc.ca/tufa_history.htm

-- 
Harmon Seaver	
CyberShamanix
http://www.cybershamanix.com

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