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Help ID pseudomorphs
  
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Andreas




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PostPosted: Jun 14, 2019 14:42    Post subject: Help ID pseudomorphs  

Hello, i am new to the forum, so dont judge me if i am posting the wrong place;) i have found two pseudomorph fossils, however i am interesting in what it could be? The Black one has some shades of gray/green and has replaced the “Shell” and not the inside of the sea urchin.
and the red one has some Strange bubbles. Might it be sorts of Chalcedony?

I hope to get some more experienced eyes on these.
Thanks



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Bob Harman




Joined: 06 Nov 2015
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PostPosted: Jun 14, 2019 15:40    Post subject: Re: Help ID pseudomorphs  

Andreas,

I will try to be of some help, but not knowing where these originated and just guessing from photos may not be of too much help. Might they be from Denmark as one photo caption suggests?

Firstly, I do not see either of these being pseudomorphs.

The 2 reddish photos, of 1(?) example, which may be cut or sliced(?) appears to show an iron stained opalized(?) chalcedony nodule associated with remaining bits of a fossil shell. The shell bits look to be around the specimen edges??

The remaining photos show what may be remaining areas of pyrite/marcasite associated with a water rounded nodule of some shale-like matrix. I do not see a fossil in these photos.

Maybe others will be of more help.....sorry. Bob
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Andreas




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PostPosted: Jun 14, 2019 16:04    Post subject: Re: Help ID pseudomorphs  

Thank you for your answer Bob!
Yes thet have both been found in Denmark when i was a child, so unfortunstely i cannot remenber where exactly.
I have added some more pictures, and Maybe it should be Said that the reddish one is a brachiopod and the other some specie of sea urchin. I am merely interested in the Minerals:) are pseudomorphs not Minerals taking form of something else? Like the Shell of a sea urchin? Though i know i shouldnt trust wikipedia thats what i found.
Best
Andreas



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Bob Carnein




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PostPosted: Jun 14, 2019 20:14    Post subject: Re: Help ID pseudomorphs  

The last two photos you posted (black object) appear, faintly, to have 5 radiating sets of paired pits. This suggests a fossil "sea urchin" (echinoid echinoderm). The flat bottom and indentation on one end of the bottom both support this. The "orange" object looks to me like a fossil bivalve (clam) that has been replaced or filled with chalcedony. If so, it should be very hard (harder than a steel knife blade).
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Andreas




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PostPosted: Jun 15, 2019 00:35    Post subject: Re: Help ID pseudomorphs  

Thank you very much for the answer, do you know abort what the Black Stone could be? It appear jetblack and have replaced the “Shell” of the urchin, these usually appear white. And it alao have very small markings of plant fossils (i cannot get a good photo of these), but that somewhat shows that it is not just a miscoloured shell.
What i mean is, Might this be some sort of Black chalcedony?
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Duncan Miller




Joined: 25 Apr 2009
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PostPosted: Jun 16, 2019 04:58    Post subject: Re: Help ID pseudomorphs  

Andreas wrote:
Might this be some sort of Black chalcedony?

Andreas - Marine fossils can be stained black by manganese, but I don't think it is possible to determine the mineral composition of your fossil from a photograph. It would take chemical and/or physical tests like relative hardness to distinguish between siliceous (chalcedony), calcareous and phosphatic shell fossils. Duncan
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Andreas




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PostPosted: Jun 16, 2019 05:58    Post subject: Re: Help ID pseudomorphs  

Duncan
Thank you for Your answer, seems like i learn something new everytime i visit this site! I Will try to look at somre testing methods. And i willl Update with Any results
Andreas
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