Meteoritical Bulletin: Entry for Northwest Africa 15897

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Northwest Africa 15897

Basic information

Name: Northwest Africa 15897
This is an OFFICIAL meteorite name.
Abbreviation: NWA 15897
Observed fall: No
Year found: 2023
Country: (Northwest Africa)
Mass: 1400 g

Classification
history:

Recommended:

CR2 [explanation]

This is 1 of 188 approved meteorites classified as CR2. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), and CR chondrites

Comments:

Approved 30 Jul 2023

Writeup

Writeup from MB 112:

Northwest Africa 15897 (NWA 15897)

(Northwest Africa)

Purchased: 2023

Classification: Carbonaceous chondrite (CR2)

History: The meteorite was purchased from a meteorite dealer in Morocco.

Physical characteristics: Many brownish fragments lacking fusion crust.

Petrography: The meteorite shows a dark brownish interior and is predominantly composed of abundant large metal-decorated type I and rare type II chondrules (apparent mean diameter about 700 µm) that often contain large metal blebs set into a fine-grained ferroan matrix. The matrix contains magnetite platelets and framboids; sulfides are present in type II chondrules and the matrix. No CAIs have been detected.

Geochemistry: olivine: Fa_7.8±10.3(Fa_0.3-30.9), contains 0.41±0.13 wt% Cr₂O₃; low-Ca pyroxene: Fs_1.9±0.5Wo_0.7±0.2(Fs_1.1-2.4Wo_0.4-1.0); matrix analyses yield an average total of 88.3±0.9 wt% (5 µm defocused beam, N=7) indicating the presence of hydrous minerals.

Data from:
  MB112
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2023
Mass (g):	1400
Pieces:	many
Class:	CR2
Shock stage:	S1
Weathering grade:	moderate
Fayalite (mol%):	7.8±10.3
Ferrosilite (mol%):	1.9±0.5
Wollastonite (mol%):	0.7±0.2
Classifier:	A. Greshake, MNB
Type spec mass (g):	24.5
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
Public domain photographs:
Ansgar Greshake

Geography:

Coordinates:

Unknown.

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

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