Meteoritical Bulletin: Entry for Northwest Africa 13470

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Northwest Africa 13470

Basic information

Name: Northwest Africa 13470
This is an OFFICIAL meteorite name.
Abbreviation: NWA 13470
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass: 104 g

Classification
history:

Meteoritical Bulletin:	MB 109	(2020)	Eucrite
Recommended:			Eucrite [explanation]

This is 1 of 598 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 11 Nov 2020

Writeup

help

Writeup from MB 109:

Northwest Africa 13470 (NWA 13470)

(Northwest Africa)

Purchased: Sept 2020

Classification: HED achondrite (Eucrite)

History: The meteorite was bought by the main mass holder from a local meteorite dealer in Mauretania.

Physical characteristics: Light-grayish rock with minor fusion crust.

Petrography: The meteorite displays a greyish to light greenish interior and is a polymict breccia composed of up to 1 cm sized basaltic, black impact melt, and mineral clasts set into a fine-grained clastic matrix. Mineral phases are predominantly exsolved pyroxene and calcic plagioclase; some magmatically zoned low-Ca pyroxenes are present attesting to a low degree of thermal metamorphism. Minor phases include silica, ilmenite, chromite, and troilite. No metallic iron has been detected. The meteorite contains shock melt veins.

Geochemistry: zoned low-Ca pyroxene: Fs_40.7±9.4Wo_5.9±0.7(Fs_29.2-52.9Wo_5.1-7.5, FeO/MnO=24-33, n=18); low-Ca pyroxene host to augite exsolution lamellae: Fs_58.8±0.4Wo_1.6±0.1(Fs_57.9-59.7Wo_1.4-1.7, FeO/MnO=28-30, n=13); Ca-pyroxene exsolution lamellae: Fs_24.4±0.7Wo_42.9±0.7(Fs_23.7-26.0Wo_41.3-43.8, FeO/MnO=25-29, n=12); calcic plagioclase: An_88.8±0.4(An_87.9-89.3, n=13)

Data from:
  MB109
  Table 0
  Line 0:

Place of purchase:	Mauritania
Date:	P Sept 2020
Mass (g):	104
Pieces:	1
Class:	Eucrite
Shock stage:	low
Weathering grade:	moderate
Ferrosilite (mol%):	40.7; 58.8; 24.4
Wollastonite (mol%):	5.9; 1.6; 42.9
Classifier:	A. Greshake, MNB
Type spec mass (g):	20.0
Type spec location:	MNB
Main mass:	Lucian Cojocaru
Comments:	Submitted by Ansgar Greshake

Institutions
and collections

MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)

Catalogs:

References:

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

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

Also see:

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Revision
history:

This lists important revisions made to data for this record.

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