Meteoritical Bulletin: Entry for Northwest Africa 13636

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Northwest Africa 13636

Basic information

Name: Northwest Africa 13636
This is an OFFICIAL meteorite name.
Abbreviation: NWA 13636
Observed fall: No
Year found: 2018
Country: Algeria
Mass: 807 g

Classification
history:

Recommended:

Eucrite-unbr [explanation]

This is 1 of 127 approved meteorites classified as Eucrite-unbr. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 16 Dec 2020

Writeup

Writeup from MB 109:

Northwest Africa 13636 (NWA 13636)

Algeria

Purchased: 2018

Classification: HED achondrite (Eucrite, unbrecciated)

History: Reportedly found near Bechar, Algeria in 2018.

Physical characteristics: Five identically appearing stones found together. All stones have smooth sand blasted exterior surfaces. Saw-cut surfaces reveal a gray, fine-grained basaltic texture.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows a intergranular texture with approximately 50% pyroxene and 40% plagioclase. Plagioclase grains are lath-shaped up to 500 μm in length. Accessory phases include chromite, Cr-rich ilmenite, and silica.

Geochemistry: (C. Agee, UNM) Low-Ca pyroxene Fs_53.7±3.6Wo_15.1±5.0, Fe/Mn=33±1, n=16; plagioclase An_86.8±0.9Ab_12.4±0.9, n=8.

Classification: Basaltic eucrite, unbrecciated

Specimens: 21.9 g on deposit at UNM, Matthew Stream holds 278.92 g, John Divelbiss holds 595.6 g stone.

Data from:
  MB109
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2018
Mass (g):	806.92
Pieces:	5
Class:	Eucrite-unbr
Shock stage:	low
Weathering grade:	moderate
Ferrosilite (mol%):	53.7±3.6
Wollastonite (mol%):	15.1±5.0
Classifier:	C. Agee, UNM
Type spec mass (g):	21.9
Type spec location:	UNM
Main mass:	John Divelbiss
Comments:	Field name MAS-4; submitted by C. Agee, UNM

Institutions
and collections

UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 109, in preparation (2020)

Find references in NASA ADS:
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Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Robert Smart
Ryan Upchurch

Geography:

Algeria

Coordinates:

Unknown.

Statistics:
This is 1 of 1277 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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