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Seymchan Pallasite

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#1 scottinash

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Posted 12 February 2024 - 01:26 PM

I purchased this small 5.4 gram slice in the early 2000's. The seller noted that it had just been reclassified as a main group pallasite, but considered anomalous due to its high content of iridium.  Apparently, before the discovery of its pallasitic structure, it had originally been classified as IIE coarse octahedrite.   It has definitely proven to be very stable and rust resistant over the years.

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Edited by scottinash, 12 February 2024 - 01:27 PM.

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#2 lee14

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Posted 12 February 2024 - 03:43 PM

I can see why the classification has varied over time. Your piece looks like a typical pallasite, but there are many examples completely lacking olivine. The Widmanstatten patterns on etched slices also seem to show wide variations, some are even curved. It's an odd one for sure.

 

Lee


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#3 leonardovaller

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Posted 13 February 2024 - 01:04 AM

I can see why the classification has varied over time. Your piece looks like a typical pallasite, but there are many examples completely lacking olivine. The Widmanstatten patterns on etched slices also seem to show wide variations, some are even curved. It's an odd one for sure.

 

Lee

I purchased this small sample as "olivine free" Seymchan two years ago

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#4 Glassthrower

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Posted 13 February 2024 - 11:54 AM

Nice Seymchan Scott. It looks like an old AZMeteorites piece.

 

Etched Seymchan siderite has a pretty etch. This is a really old photo shot on a 20 year old camera, so forgive the lack of pixels. The pallasitic pieces get most of the attention, but the all-iron ones can be nice also.

 

 

 

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#5 scottinash

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Posted 13 February 2024 - 12:15 PM

Nice Seymchan Scott. It looks like an old AZMeteorites piece.

 

Etched Seymchan siderite has a pretty etch. This is a really old photo shot on a 20 year old camera, so forgive the lack of pixels. The pallasitic pieces get most of the attention, but the all-iron ones can be nice also.

Spot on, Michael.   John is always a pleasure to deal with (though it has been a while) and I still have the tombstone newspaper somewhere that he used for packing. wink.gif 

 

Your Seymchan specimen is "handsome", for lack of a better term!  

 

I'm still trying to figure what critter shape leonardovaller's is....a "mammoth" maybe! 

 

Seymchan's definitely have heterogeneous personalities!




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