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Northwest Africa 15621
Basic information Name: Northwest Africa 15621
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15621
Observed fall: No
Year found: 2018
Country: Morocco
Mass:help 2 kg
Meteoritical Bulletin:  MB 112  (2024)  LL4
Recommended:  LL4    [explanation]

This is 1 of 410 approved meteorites classified as LL4.   [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 7 Jan 2023
Writeup from MB 112:

Northwest Africa 15621 (NWA 15621)


Purchased: February 2018

Classification: Ordinary chondrite (LL4)

History: Purchased February 2018 by John Humphries from Blaine Reed at the Tucson Gem and Mineral Show.

Physical characteristics: A single wind polished brown stone, saw cut reveals a mottled light gray and tan interior with chondrules and bright metal flecks.

Petrography: (D. Dickens, CCMS) Optical and microprobe examination of polished probe mount and BSE images shows well-delineated chondrules (range 360 - 1750 µm) set in a relatively coarse-grained matrix. Accessory phases include unaltered kamacite and troilite. No plagioclase was observed.

Geochemistry: (D. Dickens, CCMS and A. S. Bell, CUB) Olivine Fa27.9±0.6, n=7; low-Ca pyroxene Fs25.1±0.8Wo4.7±2.4, n=3.

Classification: Ordinary chondrite (LL4)

Specimens: Type specimen location Cascadia; Main mass with John Humphries

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson, AZ
Date:P February 2018
Mass (g):2000
Shock stage:S2
Weathering grade:W3
Fayalite (mol%):27.9±0.6
Ferrosilite (mol%):25.1±0.8
Wollastonite (mol%):4.7±2.4
Classifier:D. Dickens, CCMS
Type spec mass (g):20.8
Type spec location:Cascadia
Main mass:John Humphries
Comments:Field name JH06; submitted by D. Dickens
   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)
Reed: Blaine Reed, P.O. Box 1141, Delta, CO 81416, United States; Website (private address)
CCMS: Colorado Center for Meteoritic Studies 6200 Becker LN Loveland, CO 80538, United States (private address; updated 22 Jan 2024)
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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     This is 1 of 2118 approved meteorites from Morocco (plus 32 unapproved names) (plus 1 impact crater)

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