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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
Meteoritical Bulletin:  MB 112  (2024)  L6
Recommended:  L6    [explanation]

This is 1 of 12920 approved meteorites (plus 11 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
Writeup from MB 112:

Northwest Africa 15620 (NWA 15620)


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:
  Table 0
  Line 0:
Place of purchase:Arizona
Date:P 2021 Dec
Mass (g):9969
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
   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)
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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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Ryan Upchurch   


     This is 1 of 2093 approved meteorites from Morocco (plus 32 unapproved names) (plus 1 impact crater)

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