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Canyon Diablo and Widmanstätten

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#1 39.1N84.5W

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Posted 16 January 2023 - 03:38 PM

Do all Canyon Diablo meteorites have Widmanstätten pattern in them? If not, why not?
I'm an amateur astronomer, not a jewelry maker. :)

#2 lee14

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Posted 16 January 2023 - 05:31 PM

Many do, and with differing appearances. Heating or extreme pressure during the break-up can seriously mute, or even destroy any pattern. When polished and etched, such a specimen usually shows a number of bright bands unaffected by the etch process, and being harder than the remainder of the matrix, might remain higher on the surface.

 

Lee


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#3 leonardovaller

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Posted 16 January 2023 - 08:30 PM

Do all Canyon Diablo meteorites have Widmanstätten pattern in them? If not, why not?
I'm an amateur astronomer, not a jewelry maker. smile.gif

Here is a sample of mine, treated with nitric acid diluted with water.

 

Canyon Diablo 261122b.jpg

Canyon Diablo 261122.jpg


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#4 lee14

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Posted 17 January 2023 - 06:00 AM

This is a Canyon Diablo showing a typical Widmanstatten pattern, the bright bands (most appear dark in the image) are not always present.

 

Lee

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  • 204- 93g Diablo.jpg

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#5 lee14

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Posted 17 January 2023 - 06:04 AM

This Canyon Diablo shows a completely muted pattern, with the bright bands still present. The rest of the surface has taken on a granular texture due to a prolonged etching process, in an attempt to reveal any underlying pattern.

 

Lee

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  • 207- 66g b.jpg

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#6 39.1N84.5W

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Posted 17 January 2023 - 10:34 AM

Thank you.
On the widmanstatten topic... online I see certified meteorite dealers that sell Muonionalusta samples. Then I see unnamed dealers (usually from China) selling what looks like Muonionalusta... but isn't described as such. What's going on here?
I would only buy from a certified dealer, btw. I'm just wanting to know more about the market and fakes, if any.

#7 lee14

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Posted 17 January 2023 - 01:05 PM

There is no universal 'certification' regarding meteorite dealers. There are widely recognized groups, generally policing their own memberships. On the other hand, there are many reputable, high quality dealers with lengthy histories, that have no membership in any of the large organizations. The best strategy is to examine the history, admittedly easier in some cases than others. 

 

As for the Muonionalusta, I'd be extremely cautious buying anything at all from that particular country. And, with Muon so widely available, it's simple to find reliable sources. The most extreme cases I've seen from there were composed of different sized pieces of what appeared to be Muonionalusta 'scrap' (left over from cutting), that was somehow formed (pressure?) into slices and blocks. Weird looking stuff.

 

Lee




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