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2021 Fall Date Project

The MPOD Caretakers want to present meteorite falls on their fall dates. For example, Sikhote Aline on 12 February.

This Project will not dip into the MPOD archives so the Caretakers will appreciate anything you can contribute.

To reserve a date just let us know. Thank you in advance :)

Fall Calendar           Dates reserved so far

  

 
NWA 13456   contributed by Roberto Vargas, IMCA 5746   MetBul Link


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View all entries for   Meteorite (1)   Roberto Vargas (46)


  C2

TKW 169 grams. Fall not observed. Purchased 2019, Guelmim, Morocco.


 


Roberto writes:
NWA 13456 was found in 2019 in Northwest Africa. It has a very low TKW of 169g. A buddy and I were fortunate enough to purchase all of it from the main mass holder. So far we have only sliced about 30g of material off of the main mass, the rest of which will likely be sold whole.

NWA 13456 is 1 of only 2 approved meteorites classified as a C2 carbonaceous chondrite.

The only other C2 is the Antarctic, Elephant Moraine 92006, which, on top of being unavailable to the public, has a TKW of only 0.8g.

This material is extremely light. The guy who cut it compared it to styrofoam. As such, this slice has a great gram to surface area ratio. According to the MetBul writeup, NWA 13456 was given the "type 2 designation due to the presence of phyllosilicates. Oxygene isotopic composition is incompatible with CM" (see oxygen isotope study in last photo).
 


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John Divelbiss
 11/4/2021 12:26:42 PM		 thanks Andreas...yes, I understand the isotope PLOTS, and was curious about why the classifier just didn't say UNGROUPED "until further notice"...instead of just the C2 designation. The O isotopes for MUNDRABILLA 012 would be awesome to know at this point. Any volunteers out there...who has some?
Andreas Ruh
 11/4/2021 3:40:17 AM		 @John: The oxygen isotopic composition of Tagish lake is close to CI chondrites whereas the oxygen isotope composition of NWA 13456 plots in the CV-CK field. It would be interesting to know the oxygen isotopic composition of Mundrabille 012.
Bernd Pauli
 11/3/2021 1:35:14 PM		 Corrections: Moeller and Ca-Al, sorry!
Bernd Pauli
 11/3/2021 1:33:39 PM		 M*LLER-ULFF F. et al. (1993) Mundrabilla 012: A new CV2 (?) chondrite find from SW Australia (abs. Meteoritics 28-3, 1993, 451, excerpt): The size and abundance of chondrules, the abundance of "metal" and the presence of a Ca-A1 inclusion are characteristic of the CV chondrite group and inconsistent with the properties of known CI, CO, CM, CR, and CK carbonaceous chondrites.
John Divelbiss
 11/3/2021 10:53:46 AM		 Mundrabilla 012 is a CV2 in the METBull ??? hmmmm...?
John Divelbiss
 11/3/2021 10:50:40 AM		 :)...are there any CK2 or CV2's yet?
Roberto Vargas
 11/3/2021 9:02:49 AM		 Hi John D, that*s a very good question. The short answer is that it needs further study to either be placed in the *ungrouped* category or to be placed in an already established *group* (ie: CV or CK).
John Divelbiss
 11/3/2021 6:53:45 AM		 congrats Roberto. How is this C2 different than the several C2-ung meteorites, like Tagish Lake? Should this NWA also be C2-ung? Was it (ung) left off by accident or for a reason?
 

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