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Northwest Africa 15650
Basic information Name: Northwest Africa 15650
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15650
Observed fall: No
Year found: 2022
Country: Niger
Mass:help 1240 g
Classification
  history:
Recommended:  H4    [explanation]

This is 1 of 6459 approved meteorites (plus 2 unapproved names) classified as H4.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 29 Jan 2023
Writeuphelp
Writeup from MB 112:

Northwest Africa 15650 (NWA 15650)

Niger

Purchased: March 2022

Classification: Ordinary chondrite (H4)

History: Purchased on March, 2022 by Thomas C. Garner through a seller in Niamey, Niger.

Physical characteristics: A single dark brown weathered stone, with saw cut revealing an interior displaying ubiqiotous metal and many relatively small chondrules set in a light gray groundmass.

Petrography: (D. Dickens, CCMS) Microprobe and optical examination of polished probe mount shows numerous tightly packed well-delineated chondrules set in a recrystallized matrix. Chondrules have an average apparent diameter of 410±280 μm , n=10. Abundant mm sized unaltered kamacite blebs, several mm sized troilite blebs.

Geochemistry: (D. Dickens, CCMS, and A. S. Bell, CUB) Olivine Fa19.7±0.8, n=6; low-Ca pyroxene Fs16.1±2.1 Wo0.2±0.1, n=4.

Classification: Ordinary chondrite (H4)

Specimens: 20 g on deposit with Cascadia; Main mass with Logan Garner.

Data from:
  MB112
  Table 0
  Line 0:
Date:P March 2022
Mass (g):1240
Pieces:1
Class:H4
Shock stage:S2
Weathering grade:W3
Fayalite (mol%):19.7±0.8
Ferrosilite (mol%):16.1±2.1
Wollastonite (mol%):0.2±0.1
Classifier:D. Dickens, CCMS
Type spec mass (g):33
Type spec location:Cascadia
Main mass:Logan Garner
Comments:Field name TG04; submitted by D. Dickens
Institutions
   and collections		 Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
CUB: Daniel Ozdín, Mineralogical Museum of Comenius University, Faculty of Natural Sciences, Ilkovicova 6, 842 15 Bratislava, Slovakia (institutional address; updated 2 Dec 2018)
Catalogs:
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
Find references in NASA ADS:
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Geography:

Niger
Coordinates:Unknown.

Statistics:
     This is 1 of 117 approved meteorites from Niger (plus 4 unapproved names)

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