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Northwest Africa 11570
Basic information Name: Northwest Africa 11570
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11570
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 75 g
Meteoritical Bulletin:  MB 107  (2018)  H/L4
Recommended:  H/L4    [explanation]

This is 1 of 16 approved meteorites classified as H/L4.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), H/L chondrites, H/L chondrites (type 4-7), L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 16 Jan 2018
Writeup from MB 107:

Northwest Africa 11570 (NWA 11570)

(Northwest Africa)

Purchased: March 2017

Classification: Ordinary chondrite (H/L4)

History: Purchased by Sean Tutorow and Brahim Tahiri from several diferent meteorite hunters in Morocco.

Petrography: The olivine in the rock is fairly homogeneous and is in between the Fa ranges for H (Fa17.3-20.2) and L (Fa23.0 - 25.8) chondrites, leading to a classification of H/L. Although the mean low-Ca pyroxene composition (Fs17.6) is within the range of H chondrites, it is heterogeneous and is thus not definitive. Also present is rare Ca-pyroxene: Fs8.7Wo21.0 (n=1). The rock has well-defined chondrules. A few low-Ca pyroxene grains exhibit polysynthetic twinning. Chondrules haev devitrified mesostases. There is minor recrystallization apparent in the rock; there is some integration of chondrules with the matrix. Some troilite grains are polycrystalline.

Data from:
  Table 0
  Line 0:
Place of purchase:Erfoud, Morocco
Date:P March 2017
Mass (g):75.04
Shock stage:S4
Weathering grade:W5
Fayalite (mol%):21.7±1.0 (n=11)
Ferrosilite (mol%):17.6±6.6 (n=6)
Wollastonite (mol%):1.2±0.8 (n=6)
Classifier:A. Rubin, UCLA
Type spec mass (g):16.79
Type spec location:UCLA
Main mass:Sean Tutorow
Comments:Submitted by Alan Rubin
   and collections
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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     This is 1 of 8745 approved meteorites from (Northwest Africa) (plus 1880 unapproved names)
Synonymshelp: Northwest Africa 12600 (NWA 12600 is the same meteorite as NWA 11570)
NWA 12600 (NWA 12600 is the same meteorite as NWA 11570)

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