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Northwest Africa 16987
Basic information Name: Northwest Africa 16987
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 16987
Observed fall: No
Year found: 2024
Country: (Northwest Africa)
Mass:help 2 kg
Classification
  history:
Recommended:  H7    [explanation]

This is 1 of 32 approved meteorites classified as H7.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 4 Sep 2024
Writeuphelp
Writeup from MB 113:

Northwest Africa 16987 (NWA 16987)

(Northwest Africa)

Purchased: 2024

Classification: Ordinary chondrite (H7)

History: The meteorite was purchased from a dealer in Libya.

Physical characteristics: Brownish rock partly covered with fusion crust.

Petrography: The meteorite shows a strongly recrystallized texture with abundant triple junctions between adjoining mineral grains. Felspar and low-Ca pyroxene often poikilitically enclose olivine crystals. Albitic feldspar grains are typically 100 µm in size and frequently contain thin exsolution lamellae of potassium-rich alkali feldspar. No chondrule structures observed. Accessory phases include kamacite, taenite, troilite, and merrillite.

Geochemistry: olivine: Fa17.2±0.1 (Fa17.0-17.3, FeO/MnO=36±1, n=7); low-Ca pyroxene: Fs15.2±0.1Wo3.3±0.3 (Fs15.1-15.4Wo3.0-4.0, FeO/MnO=21±1, n=7); plagioclase: An9.7-14.0Ab80.4-84.0Or5.5-8.2, n=7; K-feldspar exsolutions: An8.9-9.0Ab18.8-24.0Or67.2-72.3, n=3

Data from:
  MB113
  Table 0
  Line 0:
Place of purchase:Libya
Date:P 2024
Mass (g):2000
Pieces:1
Class:H7
Shock stage:S1
Weathering grade:W1
Fayalite (mol%):17.2
Ferrosilite (mol%):15.2
Wollastonite (mol%):3.3
Magnetic suscept.:5.38
Classifier:A. Greshake, MNB
Type spec mass (g):20.7
Type spec location:MNB
Main mass:Polandmet - Marcin Cimala
Comments:Submitted by Ansgar Greshake
Institutions
   and collections		 MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
Polandmet: targoniny 30 43445 Dziegielow Poland, Poland; Website (institutional address; updated 7 May 2021)
Catalogs:
References: Published in Meteoritical Bulletin, no. 113, in preparation (2024)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
Ansgar Greshake         
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9914 approved meteorites from (Northwest Africa) (plus 1841 unapproved names)

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