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Gastropod In Pyrite Ball

pyrite gastropod

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#1 Max fragmento

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Posted 12 January 2014 - 10:06 PM

I found this in South Dakota.   I had never found a pyrite ball before but it was suspiciously round and too heavy.  That was a cool enough find...... but I just wondered if there might not be something inside.   No guts ... no glory.    A beautiful crystal filled little gastropod at the heart of the pyrite.   Super cool.!!  Maybe these are very common but so cool.   What kind of age range could we be talking about with something like this.   Did the fossil form somewhere else, get washed out of its matrix and then get encased in pyrite.   I dont have a clue about that stuff.   Thanks for any info.

 

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#2 6ix

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Posted 13 January 2014 - 04:26 AM

I have no idea, but I can tell you it's cool!



#3 Auspex

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Posted 13 January 2014 - 08:12 AM

It's lovely!

Does it streak-test black? Just wondering whether it might be some other ironstone than pyrite.


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#4 Max fragmento

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Posted 13 January 2014 - 02:41 PM

When I cut it , it was gold colored.  It has weathered to that dull gray in the course of a year.   I should try streaking it.  Good idea.

 

Max



#5 Herb

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Posted 13 January 2014 - 05:25 PM

It looks like pyrite , with possibly a gastropod as you said. Can't guess at the age w/o more info. Very pretty. If you buff it up it will shine a lng time with a coat of nail polish protectant on it.


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#6 Ludwigia

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Posted 13 January 2014 - 06:25 PM

Very nice find. I'm pretty certain that you have a cross section of a gastropod there in what used to be a clay concretion. The animal was imbedded in the clay after it died and then the organic substance from it was transformed into pyrites by bacteria which could exist in an oxygen free environment, thereby creating a concretion harder than the surrounding clay.


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