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NWA 869   contributed by Bernd Pauli   MetBul Link

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Copyright (c) Bernd Pauli.
111.1 gram end cut.   L3-6

TKW 2 tons. Fall not observed. Found in 2000.
 


Bernd writes:
111.1 gr cut endpiece with fusion crust purchased from Dean Bessey who handled most of the early NWA 869 material. There are chondrule-rich and chondrule-poor areas in this coarse-grained, chondritic regolith breccia and the finely disseminated metal flakes are much smaller than in NWA 904, an 869 look-alike. While the unequilibrated lithologies stem from a surficial layer of the parent body, the equilibrated chondritic clasts come from greater depths.

The preatmospheric radius of the NWA 869 meteoroid must have been 2.0-2.5 m, a radius that corresponds to a mass of 120-230 metric tons. The recovered mass of about 7 metric tons shows that more than 90% of the initial mass was lost by ablation during atmospheric passage.

As a matter of interest, the Antarctic L-chondrite MAC 87302 closely resembles NWA 869.


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Jim brady
 3/4/2018 3:44:49 PM
I never knew about mac 87302, thx Bernd
John Divelbiss
 2/28/2018 12:16:41 PM
nice big slab end cut Bernd. The comparisons to NWA 904 and others has always been a tough sorting out of a lot of different issues. I used to say NO to the pairing of the two but over time I've been convinced of them being paired by my own evaluations including thin sections. I've had a fair amount of material from both of these numbered NWA's.
Stephen Amara
 2/28/2018 3:33:17 AM
Beautiful piece of 869, I love this chondrite. That's a relly pretty piece you have there Bernd! Great explanation too!
 

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