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Northwest Africa 16764
Basic information Name: Northwest Africa 16764
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 16764
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 634 g
Classification
  history:
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 285 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 10 Jun 2024
Writeuphelp
Writeup from MB 113:

Northwest Africa 16764 (NWA 16764)

(Northwest Africa)

Purchased: 2021

Classification: HED achondrite (Eucrite, monomict)

History: Purchased by Jay Piatek from a northwest African meteorite dealer in 2021.

Physical characteristics: Two identically appearing individuals found together, sandblasted, light colored exterior, interior exposure on saw-cut surfaces shows light brown- and cream-colored grains segmented by shock melt veins with mild brecciation.

Petrography: (C. Agee, UNM) Microprobe and reflected light microscope examination of a polished mount shows approximately 50% pyroxene and 40% maskelynite. Pyroxenes are equilibrated low-Ca and augite. Minor phases include chromite, silica, low-Ni metal, and Fe-sulfide.

Geochemistry: (A. Ross, UNM) Low-Ca pyroxene Fs40.0±0.5Wo2.4±0.2, Fe/Mn=30±1, n=5; augite Fs16.5±0.0Wo43.7±0.2, Fe/Mn=25±1, n=3; plagioclase An93.6±0.2Ab6.1±0.3, n=4.

Classification: HED (monomict eucrite). Heavily shocked meteorite evidence by the presence of maskelynite.

Specimens: 22 g on deposit at UNM, Jay Piatek holds the main mass.

Data from:
  MB113
  Table 0
  Line 0:
Place of purchase:Northwest Africa
Date:P 2021
Mass (g):634
Pieces:2
Class:Eucrite-mmict
Shock stage:high
Weathering grade:moderate
Ferrosilite (mol%):40.0±0.5, 16.5±0.0
Wollastonite (mol%):2.4±0.2, 43.7±0.2
Classifier:C. Agee, UNM
Type spec mass (g):22
Type spec location:UNM
Main mass:Jay Piatek
Comments:Fieldname JP-4011; submitted by C. Agee
Institutions
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
Catalogs:
References: Published in Meteoritical Bulletin, no. 113, in preparation (2024)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9776 approved meteorites from (Northwest Africa) (plus 1862 unapproved names)

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