Melissawow Posted September 10, 2014 Share Posted September 10, 2014 I'll like to check out are these Arnioceras ammonites pyritized? They are from Yorkshire UK. I want to know in your opinion, are these ammonites pyritized or non-pyritized? Link to the picture: https://www.facebook.com/photo.php?fbid=10201976908256821&set=a.3256541024913.135604.1608741583&type=3&theater Link to comment Share on other sites More sharing options...
painshill Posted September 12, 2014 Share Posted September 12, 2014 I don't think there's any way to tell for sure... that's a monochrome photograph. The ammonite beds on the Yorkshire coast most usually yield specimens which are mud-infilled or pyrite-preserved, but also calcite preservation. Those look shinier than typical mud-infilled material (unless they've been polished up) but could be pyritized or calcited. Roger I keep six honest serving-men (they taught me all I knew);Their names are What and Why and When and How and Where and Who [Rudyard Kipling] Link to comment Share on other sites More sharing options...
Ptychodus04 Posted September 16, 2014 Share Posted September 16, 2014 Based on the apparent color differences (even with a B&W photo), I would say calcite. Regards, Kris Global Paleo Services, LLC https://globalpaleoservices.com http://instagram.com/globalpaleoservices http://instagram.com/kris.howe Link to comment Share on other sites More sharing options...
painshill Posted September 16, 2014 Share Posted September 16, 2014 (edited) I really don't think you could be sure. Here's some of my UK examples converted to greyscale. Don't scroll down if you want to test your observation skills... I have put the original colour pictures below GREYSCALES: # # # # # # # # # # # # # # # # COLOUR: Edited September 16, 2014 by painshill Roger I keep six honest serving-men (they taught me all I knew);Their names are What and Why and When and How and Where and Who [Rudyard Kipling] Link to comment Share on other sites More sharing options...
Ptychodus04 Posted September 17, 2014 Share Posted September 17, 2014 I still think hers are calcite. But, well made point! Regards, Kris Global Paleo Services, LLC https://globalpaleoservices.com http://instagram.com/globalpaleoservices http://instagram.com/kris.howe Link to comment Share on other sites More sharing options...
caldigger Posted September 19, 2014 Share Posted September 19, 2014 (edited) I don't think the photo that Melissa posted is black and white photography. It looks like those are the actual colors of the piece. Grey matrix and dark grey ammonites sitting on a really light grey table. The low (dim) lighting doesn't help matters either. Edited September 19, 2014 by caldigger Link to comment Share on other sites More sharing options...
painshill Posted September 20, 2014 Share Posted September 20, 2014 I don't think the photo that Melissa posted is black and white photography. It looks like those are the actual colors of the piece. Grey matrix and dark grey ammonites sitting on a really light grey table. The low (dim) lighting doesn't help matters either. Thanks Caldigger I took a second look on a rather better/larger screen than previously and also downloaded the picture this time. You're quite right... it is a colour image, not greyscale. It's difficult to say how accurate the representation is in the photographs but I do now see a faint coppery tinge in places and my revised view would be that the preservation is essentially calcited mud with weak areas of pyritization. Roger I keep six honest serving-men (they taught me all I knew);Their names are What and Why and When and How and Where and Who [Rudyard Kipling] Link to comment Share on other sites More sharing options...
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