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Northwest Africa 15620
Basic information Name: Northwest Africa 15620
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15620
Observed fall: No
Year found: 2021
Country: Morocco
Mass:help 9.97 kg
Classification
  history:
Recommended:  L6    [explanation]

This is 1 of 12281 approved meteorites (plus 8 unapproved names) classified as L6.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 7 Jan 2023
Writeuphelp
Writeup from MB 112:

Northwest Africa 15620 (NWA 15620)

Morocco

Purchased: 2021 Dec

Classification: Ordinary chondrite (L6)

History: Purchased December 2021 by John Humphries from Mark Lyon in Arizona.

Physical characteristics: A dark brown weathered stone with caliche, saw cut reveals a mottled shock darkened interior with occasional lighter areas. Ubiquitous metal flecks are visible throughout the sample.

Petrography: (D. Dickens, CCMS) Optical and microprobe examination of polished probe mount shows a mostly recrystallized matrix of olivine and pyroxene with relict chondrules. Accessory phases include kamacite, troilite, and plagioclase. Plagioclase grain size is approximately 70 µm.

Geochemistry: (D. Dickens, CCMS and A. S. Bell, CUB) Olivine Fa25.7±1.3, n=8; low-Ca pyroxene Fs20.8±0.2Wo1.6±0.2, n=8.

Classification: Ordinary chondrite (L6)

Specimens: 26 g including the probe mount on deposit at Cascadia

Data from:
  MB112
  Table 0
  Line 0:
Place of purchase:Arizona
Date:P 2021 Dec
Mass (g):9969
Pieces:1
Class:L6
Shock stage:S2
Weathering grade:W4
Fayalite (mol%):25.7±1.3
Ferrosilite (mol%):20.8±0.2
Wollastonite (mol%):1.6±0.2
Classifier:D. Dickens, CCMS
Type spec mass (g):26
Type spec location:Cascadia
Main mass:John Humphries
Comments:Field name JH05; 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:
Find references in Google Scholar:
Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Ryan Upchurch   
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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