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Northwest Africa 12805
Basic information Name: Northwest Africa 12805
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12805
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 671 g
Classification
  history:
Recommended:  Ureilite    [explanation]

This is 1 of 514 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 18 Aug 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12805 (NWA 12805)

(Northwest Africa)

Purchased: 2019

Classification: Ureilite

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

Physical characteristics: Brownish fragment without fusion crust.

Petrography: The meteorite shows a cumulate texture of olivine and pigeonite grains with highly variable grain sizes. Coarse-grained regions have grain sizes of up to 2 mm, more fine-grained regions of about 0.5 mm. The meteorite contains flaky graphite; olivine displays characteristic reduced rims.

Geochemistry: reduced rims in olivine: Fa1.2-4.7; olivine contains 0.76±0.03 wt% Cr2O3 and 0.39±0.01 wt% CaO

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2019
Mass (g):671
Pieces:1
Class:Ureilite
Shock stage:S2
Weathering grade:moderate
Fayalite (mol%):19.9±0.2 (n=11)
Ferrosilite (mol%):17.2±0.2 (n=12)
Wollastonite (mol%):6.5±0.1 (n=12)
Classifier:A. Greshake, MNB
Type spec mass (g):20.2
Type spec location:MNB
Main mass:Marcin Cimala
Comments:Submitted by Ansgar Greshake
Institutions
   and collections
MNB: Museum für Naturkunde, Invalidenstrasse 43, D-10115 Berlin, Germany (institutional address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6916 approved meteorites from (Northwest Africa) (plus 2027 unapproved names)

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