Meteoritical Bulletin: Entry for Northwest Africa 10787

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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: 1031 g

Classification
history:

Meteoritical Bulletin:	MB 105	(2016)	H4-melt breccia
Recommended:			H4-melt breccia [explanation]

This is 1 of 11 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

help

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 (Fa_18.3±1.1, Fe/Mn=41±7, n=6; PMD=2.3); low-Ca pyroxene (Fs_19.4±5.2En_79.9±5.6Wo_0.7±0.3; Fe/Mn=27±6, n=6; PMD=10.9); diopside (Fs_15.5En_60.3Wo_24.2; 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:
  MB105
  Table 0
  Line 0:

Place of purchase:	Torino
Date:	P Oct 2015
Mass (g):	1031
Pieces:	1
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:

Institutions
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)

Catalogs:

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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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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