Meteoritical Bulletin: Entry for Northwest Africa 13230

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Northwest Africa 13230

Basic information

Name: Northwest Africa 13230
This is an OFFICIAL meteorite name.
Abbreviation: NWA 13230
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass: 820 g

Classification
history:

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

This is 1 of 660 approved meteorites classified as Ureilite. [show all]
Search for other: Achondrites, Ureilites

Comments:

Approved 5 Apr 2020

Writeup

help

Writeup from MB 109:

Northwest Africa 13230 (NWA 13230)

(Northwest Africa)

Purchased: 2019

Classification: Ureilite

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

Physical characteristics: Brownish rock without fusion crust.

Petrography: The meteorite shows a cumulate texture of about 1 mm sized equigranular sized olivine grains displaying typical reduced rims. Pyroxene appears to be recrystallized from a melt and shows patchy compositional zoning. Some melt regions contain abundant vesicles. Olivine and pyroxene are enriched in Cr₂O₃ and the meteorite contains graphite; calcite filled cracks attest to intense terrestrial weathering.

Geochemistry: olivine: Fa_18.6±0.1(Fa_18.4-18.7, n=11), contains 0.52±0.07 wt% Cr₂O₃ and 0.37±0.02 wt% CaO; reduced rims in olivine: Fa_4.2-8.6; pyroxene: Fs_11.6±2.7Wo_11.0±6.7(Fs_6.9-16.0Wo_4.1-24.8,n=14), contains 0.91±0.09 wt% Cr₂O₃ and 0.44±0.25 wt% Al₂O₃

Classification: Ureilite melt rock. The melt rock designation is from the recrystallized texture of pyroxene, with patchy compositional zoning, and the abundant vesicles (similar to NWA 10870).

Data from:
  MB109
  Table 0
  Line 0:

Place of purchase:	Erfoud, Morocco
Date:	P 2019
Mass (g):	820
Pieces:	1
Class:	Ureilite
Shock stage:	low
Weathering grade:	high
Fayalite (mol%):	18.6
Ferrosilite (mol%):	11.6
Wollastonite (mol%):	11
Classifier:	A. Greshake, MNB
Type spec mass (g):	29.4
Type spec location:	MNB
Main mass:	anonymous
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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Photos:

Credit	Photos
Public domain photographs:
Ansgar Greshake

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names)

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Revision
history:

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