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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
Meteoritical Bulletin:  MB 112  (2024)  H4
Recommended:  H4    [explanation]

This is 1 of 6539 approved meteorites (plus 3 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 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 9790 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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