Meteoritical Bulletin: Entry for Northwest Africa 15811

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Northwest Africa 15811

Basic information

Name: Northwest Africa 15811
This is an OFFICIAL meteorite name.
Abbreviation: NWA 15811
Observed fall: No
Year found: 2023
Country: (Northwest Africa)
Mass: 302 g

Classification
history:

Recommended:

CM2 [explanation]

This is 1 of 626 approved meteorites classified as CM2. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites

Comments:

Approved 19 Mar 2023

Writeup

Writeup from MB 112:

Northwest Africa 15811 (NWA 15811)

(Northwest Africa)

Purchased: 2023

Classification: Carbonaceous chondrite (CM2)

History: The meteorite was purchased from a meteorite dealer in Western Sahara.

Physical characteristics: Black fragment partly covered with fusion crust.

Petrography: Carbonaceous chondrite composed of small (apparent mean diameter about 250 µm) chondrules, chondrule pseudomorphs, mineral fragments, abundant and PCP(TCI) particles, and rare CAIs many of which surrounded by fine-grained dust rims set into abundant fine-grained matrix. Matrix is Fe-rich with abundant Fe-sulfides and Ca-carbonates. Low analytical totals of matrix analyses suggest the presence of hydrous phyllosilicates.

Geochemistry: Matrix analyses yield an average total of 78.1±2.0 wt% (5 µm defocused beam, N=6) suggesting the presence of hydrous minerals.

Data from:
  MB112
  Table 0
  Line 0:

Place of purchase:	Western Sahara
Date:	P 2023
Mass (g):	302
Pieces:	1
Class:	CM2
Shock stage:	S1
Weathering grade:	low
Fayalite (mol%):	12.9±12.1 (0.8-36.2, n=20)
Ferrosilite (mol%):	1.9±0.1 (1.9-2.0, n=10)
Wollastonite (mol%):	0.4±0.1 (0.3-0.4, n=10)
Classifier:	A. Greshake, MNB
Type spec mass (g):	20.5
Type spec location:	MNB
Main mass:	Polandmet - Marcin Cimala
Comments:	Submitted by Ansgar Greshake

Institutions
and collections

MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
Polandmet: targoniny 30 43445 Dziegielow Poland, Poland; Website (institutional address; updated 7 May 2021)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 112, in preparation (2023)

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)
Domjan Svilkovic

Geography:

Coordinates:

Unknown.

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

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