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Northwest Africa 16767
Basic information Name: Northwest Africa 16767
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 16767
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 85.9 g
Classification
  history:
Recommended:  LL3    [explanation]

This is 1 of 492 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 10 Jun 2024
Writeuphelp
Writeup from MB 113:

Northwest Africa 16767 (NWA 16767)

(Northwest Africa)

Purchased: 2018 Jul

Classification: Ordinary chondrite (LL3)

History: Purchased by Bing’an Miao from a meteorite dealer Rex in Beijing in July, 2018.

Petrography: (Guozhu Chen, GUT) The meteorite consists of a close-packed aggregate of spherical to ellipsoidal chondrules,with interstitial nickel-iron and troilite (concentrated as rims to chondrules) and relatively little fine-grain matrix. Some of the chondrules are unusually large, ranging up to 3.6 mm in diameter. Most chondrules consist of porphyritic olivine and, sometimes accompanied by polysynthetically-twinned clinopyroxene, and with partly devitrified glass between the mineral grains. The low content of nickel-iron metal suggests LL group.

Geochemistry: (Guozhu Chen, GUT) Microprobe analyses show that both olivine and pyroxene are variable in composition. Olivine Fa30.7, range Fa1.2-58.5. Low-Ca pyroxene Fs20.3, range Fs1.7-55.9.

Classification: Ordinary chondrite (LL3)

Specimens: The main mass and one polished thin section are on deposited at GUT.

Data from:
  MB113
  Table 0
  Line 0:
Place of purchase:Beijing, China
Date:P 2018 Jul
Mass (g):85.9
Pieces:1
Class:LL3
Shock stage:S2
Weathering grade:W3
Fayalite (mol%):30.7±14.2 (n=57)
Ferrosilite (mol%):20.3±13.9 (n=28)
Wollastonite (mol%):1.8±2.1 (n=28)
Classifier:Guozhu Chen, Yulan Zou, Zhipeng Xia, Bingkui Miao, GUT
Type spec mass (g):85.9
Type spec location:GUT
Main mass:GUT
Finder:Anonymous
Comments:M 1812016 (Appears in Chinese literature); submitted by Zhipeng Xia, Bingkui Miao
Institutions
   and collections
GUT: College of Earth Sciences, Guilin University of Technology, 12 Jiangan Road, Guilin 541004, China (institutional address; updated 18 Oct 2012)
Beijing: Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China (institutional address; updated 16 Oct 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 113, in preparation (2024)
Find references in NASA ADS:
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Photos:
CreditPhotos
Public domain photographs:
Zhipeng Xia; Bingkui Miao      
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9776 approved meteorites from (Northwest Africa) (plus 1862 unapproved names)

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