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SV: "carbonatic" eggshell query

As far as I know at least all bird eggshells are largely "carbonatic" in
the sense that they are mostly Calcium Carbonate (there is also a small
proportion of organic material, and some also contain a small amount of
Calcium Phosphate). In so far as pterosaurs had hard eggs I imagine they
would be similar. 
Soft eggs (often described as "leathery") have membraneous shells that
are a mixture of organics (mostly proteins) and calcium carbonate. The
carbonate may be either a thin continuous layer or nodular.

Timmy Tyrberg

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Från: owner-DINOSAUR@usc.edu [mailto:owner-DINOSAUR@usc.edu] För David
Skickat: den 27 september 2009 16:58
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Ämne: "carbonatic" eggshell query

Chiappe et al. 2004 described the Pterodaustro eggshell as  
"carbonatic" . A Google query listing "eggshell" and "carbonatic"  
listed only the Chiappe et al. article.

What does "carbonatic" mean in terms of eggshells? What is this like?  
What is this not like?

David Peters
St. Louis