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Winner of the November 2016 Invertebrate / Plant Find Of The Month!

JohnJ

By JohnJ
in Fossil of the Month

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JohnJ Regular Member

JohnJ

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The Winner of the November 2016 Invertebrate / Plant Find Of The Month is the Lingula squamiformis inarticulate brachiopod from the Brigantian stage (Mississippian) of County Durham, UK!!!  Congratulations to Tarquin (TqB) on his iridescent discovery and remarkable sixth win in the contest!!!  Well done, sir!  :1-SlapHands_zpsbb015b76:

TqB 2.jpg

TqB 4.jpg

 

TqB 1.jpg

TqB 3.jpg

@TqB

 

Thank you to all other members that participated and voted.  :)

 

The human mind has the ability to believe anything is true.  -  JJ

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fifbrindacier Regular Member

fifbrindacier

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Nice ! Congratulations !

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Fossildude19 Regular Member

Fossildude19

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Lovely shell, deserving of the award!

Way to go, Tarquin. :) 

Regards,

    Tim    -  VETERAN SHALE SPLITTER

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jcbshark Regular Member

jcbshark

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Congrats on the win, that's beautiful :dinothumb:

Every once in a great while it's not just a big rock down there!

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DPS Ammonite Regular Member

DPS Ammonite

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What causes the iridescence: altered calcium phosphate shell material, oil, iron minerals? It does not look like aragonite mother of pearl. Is this common in similar fossil brachiopods?

My goal is to leave no stone or fossil unturned.   

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TqB Regular Member

TqB

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Many thanks for the kind comments and thanks to all who voted. I really didn't expect to do very well with this one but I'm glad that a little brachiopod made itself shine out. :) 

I'd have been very pleased to find any of the other entries as well, rare and beautiful specimens as always.

 

@DPS Ammonite - "What causes the iridescence: altered calcium phosphate shell material, oil, iron minerals? It does not look like aragonite mother of pearl. Is this common in similar fossil brachiopods?"   

Good question, another palaeontologist suggested that it's an artefact of the original phosphate. (I don't suppose there would have been aragonite present that could have been involved.) I guess X-ray diffraction testing might give an answer.

I've not seen it before in my specimens from this locality (which are all in iron rich nodules, not carbonate), they all have a bluish sheen though.

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Tarquin

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ynot Regular Member

ynot

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5 hours ago, TqB said:

've not seen it before in my specimens from this locality (which are all in iron rich nodules, not carbonate), they all have a bluish sheen though.

The colors remind Me of iridescent hematite. 

From Graves mountain, Lincolnton, Georgia.

aagravesb-0003.jpg

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Darwin said: " Man sprang from monkeys."

Will Rogers said: " Some of them didn't spring far enough."

 

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TqB Regular Member

TqB

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47 minutes ago, ynot said:

The colors remind Me of iridescent hematite. 

From Graves mountain, Lincolnton, Georgia.

aagravesb-0003.jpg

 

Certainly similar, or could be pyrite - there's quite a lot of rotten pyrite around in this stuff.

Tarquin

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ynot Regular Member

ynot

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4 hours ago, TqB said:

 

Certainly similar, or could be pyrite - there's quite a lot of rotten pyrite around in this stuff.

I believe that copper has to be in the pyrite (Chalcopyrite) for it to obtain that type of iridescence (Often referred to as peacock ore.).

Hematite is an iron oxide, so not a far stretch from pyrite (Iron sulfide).

 

Tony

  • I found this Informative 1

Darwin said: " Man sprang from monkeys."

Will Rogers said: " Some of them didn't spring far enough."

 

My Fossil collection - My Mineral collection

My favorite thread on TFF.

 

 

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Coco Regular Member

Coco

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Congrats Tarquin !

 

Coco

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Ma bibliothèque PDF 2 (Animaux vivants - sans poissons ni sélaciens) : ici
Mâchoires sélaciennes récentes : ici
Hétérodontiques et sélaciens : ici
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