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Northwest Africa 16164
Basic information Name: Northwest Africa 16164
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 16164
Observed fall: No
Year found: 2023
Country: (Northwest Africa)
Mass:help 2.6 kg
Meteoritical Bulletin:  MB 112  (2023)  Eucrite-melt breccia
Recommended:  Eucrite-melt breccia    [explanation]

This is 1 of 106 approved meteorites classified as Eucrite-melt breccia.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 3 Sep 2023
Writeup from MB 112:

Northwest Africa 16164 (NWA 16164)

(Northwest Africa)

Purchased: 2023 Jun

Classification: HED achondrite (Eucrite, melt breccia)

History: The meteorite was purchased from a Morrocan meteorite dealer on the meteorite fair in Ensisheim, France.

Physical characteristics: Dark grayish fragment with some fusion crust.

Petrography: Eucrite-melt breccia composed of up to s cm sized basaltic clasts plus up to 700 µm sized mineral fragments in black melt rock matrix. Main minerals are exsolved pyroxenes and calcic plagioclase. The shock melt is mostly finely recrystallized and contains acicular pyroxene and plagioclase. Mineral grains entrained in the melt matrix often show resorption textures. Minor phases include silica, chromite, ilmenite, and FeS. No metallic iron detected.

Geochemistry: low-Ca pyroxene host to exsolution lamellae: Fs60.0±0.5Wo2.9±0.6 (Fs58.9-60.7Wo2.1-4.0, FeO/MnO=29-31, n=10); Ca-pyroxene exsolution lamellae: Fs26.9±0.3Wo42.9±0.3 (Fs26.2-27.2Wo42.2-43.3, FeO/MnO=29-33, n=10); calcic plagioclase: An87.2±0.6 (An85.9-88.2, n=10).

Data from:
  Table 0
  Line 0:
Place of purchase:Ensisheim, France
Date:P 2023 Jun
Mass (g):2600
Class:Eucrite-melt breccia
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):60.0; 26.9
Wollastonite (mol%):2.9; 42.9
Classifier:A. Greshake, MNB
Type spec mass (g):21.9
Type spec location:MNB
Main mass:Tomasz Jakubowski
Comments:Submitted by Ansgar Greshake
   and collections
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
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     This is 1 of 9772 approved meteorites from (Northwest Africa) (plus 1862 unapproved names)

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