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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:
Meteoritical Bulletin:  MB 112  (2024)  H4
Recommended:  H4    [explanation]

This is 1 of 6539 approved meteorites (plus 3 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)
CCMS: Colorado Center for Meteoritic Studies 6200 Becker LN Loveland, CO 80538, United States (private address; updated 22 Jan 2024)
Catalogs:
References: Published in Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Cartier C., Consolmagno G., Goodrich C., Greshake A., Gross J., Joy K. H., Miao B. and Zhang B. (2024) The Meteoritical Bulletin, no. 112. Meteoritics & Planetary Science 59, 1820–1823. ?
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Geography:

Niger
Coordinates:Unknown.

Statistics:
     This is 1 of 123 approved meteorites from Niger (plus 4 unapproved names)

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