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Northwest Africa 16183
Basic information Name: Northwest Africa 16183
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 16183
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 410 g
Recommended:  H4    [explanation]

This is 1 of 6459 approved meteorites (plus 2 unapproved names) classified as H4.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 30 Sep 2023
Writeup from MB 112:

Northwest Africa 16183 (NWA 16183)

(Northwest Africa)

Purchased: 2021 Sep

Classification: Ordinary chondrite (H4)

History: Mr. Jasper Spencer purchased three stones from a Mauritanian dealer in September 2021 via FB Messenger, and was told by the seller that these were found in Mauritania in 2021. Cascadia received an end cut with a mass of 80.3 g from the largest stone, which was 295 g before cutting

Physical characteristics: Physical Characteristics: The exterior portion of the end cut is entirely coated in a dark brown to black fusion crust. The cut surface shows abundant metal and sulfide grains. Numerous chondrules are visible, many partially or completely rimmed by metal.

Petrography: (G. Anim, D. Sheikh, M. Hutson, and A. Ruzicka, Cascadia) The thin section displays a closely packed aggregate of barred olivine, porphyritic olivine, porphyritic olivine pyroxene, radial pyroxene, cryptocrystalline pyroxene, and granular to microporphyritic olivine chondrules and chondrule fragments. Chondrules are well-defined and are set in a primarily black matrix containing abundant nickel-iron and troilite. Much of the metal and troilite contains angular silicate inclusions. A few metal grains contain rounded troilite nodules giving them a sort of boiled or fried egg appearance.

Geochemistry: Olivine: Fa18.1±1.0 (N = 37); Low-Ca pyroxene Fs15.7±2.8Wo0.8±0.3 (N = 26).

Classification: Ordinary Chondrite (H4) based on mineral chemistry and texture.

Specimens: Cascadia holds 77.1 g in one piece, as well as one polished thin section and material in an epoxy stub. Mr. Jasper Spencer holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:FB Messenger
Date:P 2021 Sep
Mass (g):410
Shock stage:S4
Weathering grade:W1
Fayalite (mol%):18.1±1.0 (n=37)
Ferrosilite (mol%):15.7±2.8 (n=26)
Wollastonite (mol%):0.8±0.3 (n=26)
Classifier:G. Anim, D. Sheikh, M. Hutson, and A. Ruzicka, Cascadia
Type spec mass (g):80.3
Type spec location:Cascadia
Main mass:Mr. Jasper Spencer
Comments:Lab number CML 1514; 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. 112, in preparation (2023)
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     This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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