kingcobb Posted November 18, 2019 Share Posted November 18, 2019 Recieved these in the mail today. I have several ammonites, no nautilus, and no polished ammonites. These arrived today and are absolutely gorgeous. I like the ammonite, but to be honest I fond the Nautilus absolutely stunning. Not certain if that is opal on the shell or not but it is gorgeous. Just thought I would share. 3 Link to comment Share on other sites More sharing options...
Tidgy's Dad Posted November 18, 2019 Share Posted November 18, 2019 Very nice indeed. The siphuncle on the nautilus is very clear too. From Madagascar? The layer of shell that you refer to as 'opalized' is the nacreous layer of the shell, aragonite and conchiolin and found in many molluscs. 2 Life's Good! Tortoise Friend. Link to comment Share on other sites More sharing options...
Ludwigia Posted November 18, 2019 Share Posted November 18, 2019 And what you have in both are polished calcitized steinkerns of the phragmocones. 1 Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
Ruger9a Posted November 18, 2019 Share Posted November 18, 2019 Beautiful specimens...…... 1 Link to comment Share on other sites More sharing options...
kingcobb Posted November 18, 2019 Author Share Posted November 18, 2019 42 minutes ago, Tidgy's Dad said: Very nice indeed. The siphuncle on the nautilus is very clear too. From Madagascar? The layer of shell that you refer to as 'opalized' is the nacreous layer of the shell, aragonite and conchiolin and found in many molluscs. Yes, both came from Madagascar. Link to comment Share on other sites More sharing options...
kingcobb Posted November 18, 2019 Author Share Posted November 18, 2019 27 minutes ago, Ludwigia said: And what you have in both are polished calcitized steinkerns of the phragmocones. Thanks for the info. I just went down a rabbit hole of what is a stinkern vs a mold vs a cast. Link to comment Share on other sites More sharing options...
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