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What Is This?

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#1 Tom Duncan

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Posted 16 June 2018 - 10:24 AM

This was in a large astronomy collection I recently bought, have no idea what it is or even if it is related to 'space rocks'. Maybe it's a naturally forming crystal or some such. 

 

In any event, anyone know what this is? About 4.75"/5" in diameter, about 3/8" thick in the middle, 1/4" at the edge. Looks to be a sandwich of some sort, pattern looks to radiate from the center. 

 

Thanks in advance for your input. 

 

Tom Duncan 

 

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#2 ToxMan

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Posted 16 June 2018 - 10:57 AM

Looks man made, smelted...cool looking. But what do I know.



#3 plane48

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Posted 16 June 2018 - 11:13 AM

Sand Dollar?


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#4 TOMDEY

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Posted 16 June 2018 - 11:22 AM

Newton's very 1st attempt at mirror-making?



#5 scngc7317

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Posted 16 June 2018 - 11:23 AM

Looks like my wife's cooking  foreheadslap.gif



#6 Tom Duncan

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Posted 16 June 2018 - 11:30 AM

Man-made sand dollar, the best suggestion so far!



#7 alvarete

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Posted 16 June 2018 - 11:49 AM

Tomdey +1



#8 Stargezzer

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Posted 16 June 2018 - 11:54 AM

Tom, you might call over to the Orange C0. Natural History Museum or email your photo to them. It is very possibly a fossil sand dollar but the serrated edges of the impression are either eroded or it maybe a fossil palm leaf. Very interesting. 

 

George



#9 Tom Duncan

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Posted 16 June 2018 - 12:23 PM

Thanks for the tip George good idea, I'll check with the geology department of my local university, Chico State. I suspect you think I'm in Chino, CA but I'm actually up in NorCal in Chico. 

 

I kinda doubt its a fossil as it appears, and at 18oz it weighs, like metal. It's not magnetic at all. 

 

Tom



#10 Tom Duncan

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Posted 16 June 2018 - 12:28 PM

I've got an email into Chico State's Geology dept, though as this is summer I may not get a response. 

 

Tom 



#11 Jim4321

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Posted 16 June 2018 - 01:50 PM

I won't swear to this, but I think I've seen similar at gem & mineral shows.  If I'm right, I think it's a naturally-occurring mineral deposit, but I have no idea of a search term to confirm this.

 

Jim H.



#12 Stargezzer

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Posted 16 June 2018 - 02:27 PM

Tom, I did read your location as Chino. Chico State would be even better for getting an opinion.

 

 

george



#13 rsalpine

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Posted 16 June 2018 - 03:50 PM

I don't recall ever seeing one myself, but it looks like you may have a pyrite 'dollar', a type of pyrite concretion often called a pyrite sun. Being formed from pyrite they would appear metallic, would be heavier than most rocks and would also be non-magnetic.

 

As Jim4321 suggested above, they would be commonly seen at gem & mineral shows.

 

http://www.spiritroc...yrite_Suns.html

 

Ron


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#14 Tom Duncan

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Posted 16 June 2018 - 04:44 PM

Confirmed, it's a "Pyrite Sun", aka "Minors Dollar", "Pyrite Dollar" and "Sun Dollar", according to the article Ron linked above and the rock shop here in Chico I went to this afternoon.  

 

The material between the two outside plates looks like it could be shale (flat gray in color) but in the article I see a reference to artificially gluing two 'dollars' together. I'll have to do more research. 

 

Thanks all, and especially Ron. 

 

Tom 


Edited by Tom Duncan, 16 June 2018 - 04:53 PM.

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#15 sickfish

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Posted 16 June 2018 - 04:55 PM

“What is this”

35 mm film. 


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