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Northwest Africa 15653
Basic information Name: Northwest Africa 15653
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15653
Observed fall: No
Year found: 2022
Country: Algeria
Mass:help 320 g
Meteoritical Bulletin:  MB 112  (2024)  LL3
Recommended:  LL3    [explanation]

This is 1 of 501 approved meteorites classified as LL3.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 29 Jan 2023
Writeup from MB 112:

Northwest Africa 15653 (NWA 15653)


Purchased: Jan 2022

Classification: Ordinary chondrite (LL3)

History: Purchased January 21, 2022 by William O’Hara of Berthoud, Colorado from Mohamad Adi in Morocco who purchased it from a local fisherman.

Physical characteristics: A single brown stone with a sand-polished stone with well defined tightly packed chondrules visible on the exterior with the unaided eye. The main mass shows two areas on the exterior where ~5mm chondrules appear to have been excavated. Saw cut reveals an interior with numoerous chondrules of various sizes with no metal visible.

Petrography: (D. Dickens, CCMS) Optical and microprobe examination of polished probe mount and BSE images show an unbrecciated chondritic meteorite with tightly packed well-delineated unequilibrated chondrules (apparent mean diameter ~1088±785 µm, n=11) set in a fine-grained matrix. Rare sulfides and metal observed.

Geochemistry: (D. Dickens, CCMS and A. S. Bell, CUB) olivine Fa15.4±8.1, range Fa3.2-23.9, n=20; range Cr2O3 in ferroan olivine 0.01-0.12 wt.%, mean 0.06±0.04 wt.%, n=17; Ca-pyroxene Fs14.4±7.8Wo1.2±0.5, range Fs6.6-22.3Wo0.2-4.1, n=3.

Classification: Ordinary chondrite (LL3)

Specimens: 20 g on deposit with Cascadia; Main mass with William O’Hara.

Data from:
  Table 0
  Line 0:
Date:P Jan 2022
Mass (g):320
Shock stage:S1
Weathering grade:W1
Fayalite (mol%):15.4±8.1
Ferrosilite (mol%):14.4±7.8
Wollastonite (mol%):1.2±0.5
Classifier:D. Dickens, CCMS
Type spec mass (g):20
Type spec location:Cascadia
Main mass:William O Hara
Comments:Field name WO01; 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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     This is 1 of 1376 approved meteorites from Algeria (plus 31 unapproved names) (plus 4 impact craters)

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