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Northwest Africa 10787
Basic information Name: Northwest Africa 10787
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10787
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 1031 g
Meteoritical Bulletin:  MB 105  (2016)  H4-melt breccia
Recommended:  H4-melt breccia    [explanation]

This is 1 of 12 approved meteorites (plus 1 unapproved name) classified as H4-melt breccia.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 17 Dec 2016
Writeup from MB 105:

Northwest Africa 10787 (NWA 10787)

(Northwest Africa)

Purchased: Oct 2015

Classification: Ordinary chondrite (H4, melt breccia)

History: Collected by nomads in Western Sahara and purchased by Compagnucci at the Torino Mineral Fair in October 2015 from a Moroccan dealer.

Physical characteristics: Single stone, dark brown crust. The sawn surface shows a black matrix with scattered metal spots and shock-melted veins.

Petrography: (V. Moggi Cecchi, G. Pratesi, S. Caporali, UniFi) The thin polished section displays a brecciated texture with chondritic clasts in a melted matrix; the clasts show several chondrules of various types (mostly RP, PP and C) ranging in size from 200 to 600 μm in diameter within a dark, very fine-grained black matrix. The matrix contains scattered grains of metal and rounded troilite blebs. Shock stages are S3 for clasts and S5 for matrix.

Geochemistry: EMP (V. Moggi Cecchi, G. Pratesi, S. Caporali, UniFi) Olivine (Fa18.3±1.1, Fe/Mn=41±7, n=6; PMD=2.3); low-Ca pyroxene (Fs19.4±5.2En79.9±5.6Wo0.7±0.3; Fe/Mn=27±6, n=6; PMD=10.9); diopside (Fs15.5En60.3Wo24.2; 1.3 Al2O3, 1.2 Cr2O3, 0.7 MnO, all wt. %); Oxygen isotopes: (I.Franchi, R.Greenwood, OU) δ17O = 3.15 ‰, δ18O = 4.42 ‰, Δ17O = 0.85 ‰.

Classification: Ordinary chondrite (H4-melt breccia); S3; W1.

Specimens: A total of 48.7 g specimen and one thin section are on deposit at MSN-FI. Compagnucci holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Torino
Date:P Oct 2015
Mass (g):1031
Class:H4-melt breccia
Shock stage:S3
Weathering grade:W1
Fayalite (mol%):18.3±1.1 (n=14)
Ferrosilite (mol%):18.4±5.4 (n=12)
Wollastonite (mol%):0.9±0.3
Classifier:V. Moggi Cecchi, S. Caporali, G. Pratesi, MSN-FI
Type spec mass (g):48.7
Type spec location:MSN-FI
Main mass:Compagnucci
Comments:Submitted by Vanni Moggi Cecchi
Plots: O isotopes:  
   and collections
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
MSN-FI: Museo di Storia Naturale “La Specola”, Sez. Mineralogia – Sistema Museale dell'Università degli Studi di Firenze Via Giorgio La Pira, 4 – 50121 Firenze, Italy; Website (institutional address; updated 24 Oct 2022)
UniFi: Università degli Studi di Firenze, P.zza S. Marco, 4 - 50121 Firenze, Italy (institutional address; updated 14 Sep 2013)
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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     This is 1 of 9746 approved meteorites from (Northwest Africa) (plus 1866 unapproved names)

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