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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
Recommended:  LL3    [explanation]

This is 1 of 469 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)
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
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     This is 1 of 1315 approved meteorites from Algeria (plus 30 unapproved names) (plus 4 impact craters)

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