Interesting Shell fossil, any ideas?

[Caroboneferous]

I found this interesting shell (I think) embedded in limestone with a bunch of other Carboniferous fossils.   This was found in the Kansas City, MO area.  
 

There are these really interesting swirls on the shell I haven’t really seen that before, I’m going to try to remove the fossil from its matrix.   Any ideas? 

[Coco]

I don't know if there is a fossil here, but what I can see is named beekite.

 

Coco

[DPS Ammonite]

11 minutes ago, Coco said:

I don't know if there is a fossil here, but what I can see is named beekite.

 

Coco

It is a shell replaced by beekite (chalcedony). I think that all beekite forms from calcareous fossils. Can anyone find an example of beekite that is not a fossil?

[FranzBernhard]

1 hour ago, DPS Ammonite said:

Can anyone find an example of beekite that is not a fossil?

Yes, wikipedia entry for beekite links to that article:

Beekite on carbonate clasts (link to wiley, only abstract available)

Franz Bernhard

[DPS Ammonite]

Just now, FranzBernhard said:

Yes, wikipedia entry for beekite links to that article:

Beekite on carbonate clasts (link to wiley, only abstract available)

Franz Bernhard

Thanks Franz. I suspected that pieces of non fossil carbonate may turn into beekite. I have never seen any and there is probably little collector interest. Wiki is getting better; you can find good references.

[TqB]

2 hours ago, DPS Ammonite said:

It is a shell replaced by beekite (chalcedony). I think that all beekite forms from calcareous fossils. Can anyone find an example of beekite that is not a fossil?

I have this from the south Devonshire coast, which I think is where beekite was first described. On a clast of Devonian limestone I think.

 

Edited July 6, 2021 by TqB

[DPS Ammonite]

There is probably a connection to chalcedony beekite and the much larger and usually individual chalcedony roses (not fossil related) that occur in arid area lavas. They are common in Arizona and California.

Edited July 6, 2021 by DPS Ammonite

[Caroboneferous]

Thanks guys!  This is a piece of limestone and there are shell fragments throughout.   There are also a few crinoid stems.   It’s very possible this formed from a fossil, I’ll post pictures whenever I can remove it from the limestone. 

[Caroboneferous]

On 7/6/2021 at 3:56 AM, TqB said:

I have this from the south Devonshire coast, which I think is where beekite was first described. On a clast of Devonian limestone I think.

 

Hey!  Just wanted to show you the results after I opened the fossil.   It turned out to a brachiopod.   It looks like the organic material was replaced with beekite?   I’m not 100 percent sure.  

[abyssunder]

On 7/6/2021 at 9:15 AM, DPS Ammonite said:

I think that all beekite forms from calcareous fossils. Can anyone find an example of beekite that is not a fossil?

As Franz B. mentioned previously there is a good reference in Kazanci and Varol, 1993. I posted it in TFF in the past, but I can't find the topic. So here it is: beekite Kazanci-Varol.1993.pdf

 

"Beekite is a clast surface feature formed by silicification. Since the original description by Hughes (1889), beekite is known to consist of tightly packed silica discs, which are mainly 2-4 mm in diameter which have a well-developed concentric pattern of rings. This form of silica occurs as a replacement of skeletal carbonate grains or an infill of dissolution voids in such grains (A.G.I., 1977), or as a replacement of carbonate rock clasts, and shows no evidence of organic origin (McBride, 1988)."

 

 

[erose]

I do see the beekite imposed on the ribs of either a brachiopod or bivalve.