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Northwest Africa 12977
Basic information Name: Northwest Africa 12977
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12977
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 958 g
Classification
  history:
Meteoritical Bulletin:  MB 108  (2020)  LL3
Recommended:  LL3    [explanation]

This is 1 of 452 approved meteorites classified as LL3.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 2 Nov 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12977 (NWA 12977)

(Northwest Africa)

Purchased: 2019 Aug

Classification: Ordinary chondrite (LL3)

Petrography: (K. Metzler, IfP) Ordinary chondrite of low petrologic type, consisting of closely packed chondrules (up to 2.2 mm) and chondrule fragments with low amounts of interchondrule matrix. The mean apparent chondrule size is 560 μm (n=68). Metal is almost completely oxidized by terrestrial weathering.

Geochemistry: Mineral compositions and geochemistry: The mean olivine composition is Fa21.1±10.1 (5.1-44.4; n=26); the mean low-Ca pyroxene composition is Fs13.0±6.7 Wo1.4±1.2 (Fs1.7-31.7 Wo0.3-4.4; n=32).

Classification: LL chondrite based on the mean chondrule size. Petrologic subtype estimated as 3.5 due to the chemical variation of olivine (PMD of Fa values: 48).

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2019 Aug
Mass (g):958
Pieces:1
Class:LL3
Shock stage:S3
Weathering grade:W4
Fayalite (mol%):21.1±10.1
Ferrosilite (mol%):13.0±6.7
Wollastonite (mol%):1.4±1.2
Classifier:K. Metzler, IfP
Type spec mass (g):20
Type spec location:IfP
Main mass:Mirko Graul, Bernau, Germany
Comments:Submitted by K. Metzler, IfP
Institutions
   and collections		 IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9111 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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