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Northwest Africa 16345
Basic information Name: Northwest Africa 16345
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 16345
Observed fall: No
Year found: 2022
Country: Mauritania
Mass:help 900 g
Classification
  history:
Meteoritical Bulletin:  MB 112  (2024)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 424 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 3 Jan 2024
Writeuphelp
Writeup from MB 112:

Northwest Africa 16345 (NWA 16345)

Mauritania

Find: January 2022

Classification: HED achondrite (Eucrite, polymict)

History: Found in January 2022 in Mauritania; later purchased on 3/23/22 by Chris Monk from Younes Chaoui.

Physical characteristics: Two stones (709.7 and 189.6 g) with minor dark-brown fusion crust.

Petrography: (D. Sheikh, Cascadia) Sample is a polymict breccia comprised predominantly of sub-angular to sub-rounded lithic clasts (mm to cm-sized, largest clast ~1.5 cm in largest dimension) and mineral clasts (mm-sized) set within a fine-grained fragmental matrix. Clast lithologies are predominantly eucritic (>90 vol. %, representing a mix of both basaltic + cumulate lithologies; primarily comprised of low-Ca pyroxene, pigeonite (some zoned), high-Ca pyroxene (some exsolved), and calcic plagioclase) with minor diogenite contribution (<10 vol. %; primarily comprised of orthopyroxene). Accessory phases identified include SiO2-rich glass, troilite, Ca-phosphate, ilmenite, and chromite.

Geochemistry: Eucrite [Low-Ca Pyroxene (Fs45.7±7.7Wo3.2±0.9, range Fs35.4-56.6Wo2.2-4.7, Fe/Mn=31±2, n=7), Pigeonite (Fs45.2±8.7Wo8.1±2.7, range Fs32.2-57.3Wo5.0-13.9, Fe/Mn=29±2, n=24), High-Ca Pyroxene (Fs30.6±7.3Wo37.6±7.3, range Fs21.4-40.6Wo26.8-43.8, Fe/Mn=30±2, n=7), Calcic Plagioclase (An91.1±2.6, range An83.5-94.4, n=21)]; Diogenite [Orthopyroxene (Fs32.1±0.4Wo3.2±0.8, range Fs31.8-32.4Wo2.6-3.7, Fe/Mn=30±1, n=3)].

Classification: Eucrite (polymict breccia).

Specimens: 29.6 g at Cascadia, main mass with Chris Monk.

Data from:
  MB112
  Table 0
  Line 0:
Date:January 2022
Mass (g):900
Pieces:2
Class:Eucrite-pmict
Shock stage:moderate
Weathering grade:low
Ferrosilite (mol%):45.7±7.7, 45.2±8.7, 30.6±7.3, 32.1±0.4
Wollastonite (mol%):3.2±0.9, 8.1±2.7, 37.6±7.3, 3.2±0.8
Classifier:D. Sheikh, Cascadia
Type spec mass (g):29.6
Type spec location:Cascadia
Main mass:Chris Monk
Comments:CML 1622; CM020; submitted by Daniel Sheikh
Institutions
   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)
Catalogs:
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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Geography:

Mauritania
Coordinates:Unknown.

Statistics:
     This is 1 of 227 approved meteorites from Mauritania (plus 2 unapproved names) (plus 2 impact craters)

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