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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
Classification
  history:
Recommended:  LL4    [explanation]

This is 1 of 388 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
Writeuphelp
Writeup from MB 112:

Northwest Africa 15621 (NWA 15621)

Morocco

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:
  MB112
  Table 0
  Line 0:
Place of purchase:Tucson, AZ
Date:P February 2018
Mass (g):2000
Pieces:1
Class:LL4
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
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)
Reed: Blaine Reed, P.O. Box 1141, Delta, CO 81416, United States; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
Find references in NASA ADS:
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Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1967 approved meteorites from Morocco (plus 37 unapproved names) (plus 1 impact crater)

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