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Northwest Africa 16689
Basic information Name: Northwest Africa 16689
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 16689
Observed fall: No
Year found: 2023
Country: (Northwest Africa)
Mass:help 724 g
Recommended:  H6    [explanation]

This is 1 of 6996 approved meteorites (plus 6 unapproved names) classified as H6.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 5 May 2024
Writeup from MB 113:

Northwest Africa 16689 (NWA 16689)

(Northwest Africa)

Purchased: 2023 Oct 14

Classification: Ordinary chondrite (H6)

History: Sample was purchased from ET Meteorites by A. Ruzicka as part of a group of unclassified northwest African stones, which were donated to Cascadia.

Physical characteristics: Physical Characteristics: The meteorite was entirely covered by a medium-brown weathered fusion crust displaying a smooth rounded surface on one side and regmaglypts on the other side. Cut faces showed abundant metal and sulfide with no evidence of terrestrial weathering.

Petrography: (M. Hutson, D. Pierce, and A. Ruzicka, Cascadia): Much of the thin section is composed of equigranular grains of silicate, metal, troilite, and chromite. Amidst this background, barely discernible chondrules are visible. Numerous plagioclase feldspar grains >50 µm across are present. Both merrillite and chlor-apatite were observed in thin section. Metal and troilite appear fresh with ~ 2% replacement by terrestrial weathering products.

Geochemistry: Olivine: Fa19.8±0.3, N=12; low-Ca pyroxene: Fs17.3±0.2Wo1.3±0.2, N=10, plagioclase feldspar: Ab82.1±0.8Or5.4±0.5An12.5±0.3, N=5.

Classification: Ordinary chondrite (H6) based on mineral chemistry, texture, and plagioclase feldspar grain size.

Specimens: Cascadia holds 712.9 g in three pieces, as well as a polished thin section and material in an epoxy butt.

Data from:
  Table 0
  Line 0:
Place of purchase:ET Meteorites, Portland Oregon, USA
Date:P 2023 Oct 14
Mass (g):724
Shock stage:S2
Weathering grade:W1
Fayalite (mol%):19.8±0.3 (N=12)
Ferrosilite (mol%):17.3±0.2 (N=10)
Wollastonite (mol%):1.3±0.2 (N=10)
Classifier:M. Hutson, D. Pierce, and A. Ruzicka, Cascadia
Type spec mass (g):724
Type spec location:Cascadia
Main mass:Cascadia
Comments:Lab number CML 1729; submitted by Melinda Hutson
   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)
References: Published in Meteoritical Bulletin, no. 113, in preparation (2024)
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     This is 1 of 9829 approved meteorites from (Northwest Africa) (plus 1851 unapproved names)

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