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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:help 820 g
Classification
  history:
Recommended:  Ureilite    [explanation]

This is 1 of 531 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 5 Apr 2020
Writeuphelp
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: Fa18.6±0.1 (Fa18.4-18.7, n=11), contains 0.52±0.07 wt% Cr2O3 and 0.37±0.02 wt% CaO; reduced rims in olivine: Fa4.2-8.6; pyroxene: Fs11.6±2.7Wo11.0±6.7 (Fs6.9-16.0Wo4.1-24.8 ,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 f├╝r Naturkunde, Invalidenstra├če 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:
CreditPhotos
Public domain photographs:
Ansgar Greshake      
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7354 approved meteorites from (Northwest Africa) (plus 1958 unapproved names)

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