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Northwest Africa 13583
Basic information Name: Northwest Africa 13583
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13583
Observed fall: No
Year found: 2019
Country: Tunisia
Mass:help 78 kg
Classification
  history:
Recommended:  Eucrite    [explanation]

This is 1 of 589 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 19 Nov 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13583 (NWA 13583)

Tunisia

Purchased: Jul. 2019

Classification: HED achondrite (Eucrite)

History: Purchased by Bo Zhang in Jul. 2019 from an anonymous dealer.

Physical characteristics: A single large stone with a gray fusion crust and a few holes.

Petrography: The monomict brecciated specimen is composed dominantly of subhedral pyroxene and subhedral or lath-shaped plagioclase up to 0.5 mm. Pyroxene is extensively exsolved with µm-sized (<1 to 10 µm) lamellae. Accessory minerals include ilmenite, troilite and silica. Impact melt veins are present.

Geochemistry: Plagioclase (An85.6-97.6Or0.1-1.3, n=10), low-Ca pyroxene (Fs61.4-65.6Wo1.4-5.8, FeO/MnO=31.6-37.0, n=8), Ca-rich pyroxene (Fs28.3-41.8Wo31.7-42.5, FeO/MnO=29.4-33.0, n=8).

Classification: The brecciated texture, calcic plagioclase, relatively homogeneous composition of pyroxene are consistent with monomict eucrites.

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P Jul. 2019
Mass (g):78000
Pieces:1
Class:Eucrite
Ferrosilite (mol%):64.0±1.6 (n=8);32.7±5.6 (n=8)
Wollastonite (mol%):2.5±1.6 (n=8);38.9±4.6 (n=8)
Classifier:Wu Y.
Type spec mass (g):20
Type spec location:PMO
Main mass:Bo Zhang
Comments:Submitted by Hsu W.
Institutions
   and collections		 PMO: Purple Mountain Observatory, Nanjing, China (institutional address; updated 16 Dec 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Photos:
CreditPhotos
Public domain photographs:
Weibiao Hsu   
Geography:

Tunisia
Coordinates:Unknown.

Statistics:
     This is 1 of 81 approved meteorites from Tunisia

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