Graham Macleod
5/6/2016 7:07:27 PM |
Thanks for sharing Paul.
This has an excellent etch and as Mendy mentioned, A very interesting matrix to it!
Cheers M8. |
Mark Bittmann
5/5/2016 11:57:36 AM |
Very interesting matrix. |
Mendy Ouzillou, IMCA #8395
5/5/2016 8:21:15 AM |
nd the type specimen was 8 grams. A tad small for a heterogeneous meteorite. Of course, the type specimen for NWA 968 was a mere 4 grams, so that's not much better. But, 40 grams were submitted for NWA 2680, so I'd lean towards that result. I could be missing a large piece analyzed as a winonaite, but...I think the gross modal abundances of meteorites like NWA 2680 (check out photos) speak for themselves."
"David Weir: What I really think is that the IAB and winonaite groups need to be unified in some way to prevent such discrepancies." |
Mendy Ouzillou, IMCA #8395
5/5/2016 8:19:28 AM |
I believe that the classification was based on very small samples that favored the silicate portion and not the iron. This material is paired to NWA 5980. On July 10, 2012, David Weir, Jason Utas and I discussed this classification as we were all a bit perplexed by it. We also discussed the possibility this is paired to NWA 2680 and NWA 968 that are both IAB-sLH.
Here are a few key excerpts from the discussion:
"Jason Utas: The meteorite's structure is pretty typical for a silicated iron. I'd vote for silicated IAB since 99% of samples are primarily Fe-Ni. I don't know what was sent in for analysis, but I've not seen a single piece of this meteorite over a few grams that didn't look like a predominantly iron meteorite with silicate inclusions.
I think [sic] that the first (large) specimen of this find classified was NWA 2680 - described as a silicated iron.
The first analysis performed on this meteorite was as NWA 968, I believe. NWA 4024 has a listed tkw of 34 grams, a |
John Divelbiss
5/5/2016 7:24:44 AM |
throw in the occasional reminant chondrule found in winonaites and they really becomes puzzling to ponder on. In the case of NWA 4024, this is one that seems to be more metal than stone. |
MexicoDoug
5/5/2016 12:55:13 AM |
Very puzzling metal rich meteorite. Just when you think you know what an iron meteorite is, these hybrid types get thrown into the 'mix'. So beautiful to look at, thanks! |
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