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Northwest Africa 13668
Basic information Name: Northwest Africa 13668
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13668
Observed fall: No
Year found: 2018
Country: Algeria
Mass:help 110 g
Classification
  history:
Recommended:  Eucrite    [explanation]

This is 1 of 490 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 10 Jan 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13668 (NWA 13668)

Algeria

Find: 2018

Classification: HED achondrite (Eucrite)

History: Purchased in 2020 by Matthew Stream from a seller in Algeria.

Physical characteristics: Single stone with slightly weathered fusion crust.

Petrography: (D. Sheikh, FSU) Specimen exhibits a primarily ophitic texture and is composed of calcic plagioclase (some partly maskelynized), low-Ca pyroxene, pigeonite, and high-ca pyroxene (400±50 µm), with accessory chromite (some containing up to 15.8 wt% TiO2), ilmenite, zircon, and SiO2-rich glass.

Geochemistry: Low-Ca Pyroxene (Fs59.5±1.2Wo3.6±0.9, range Fs56.9-61.5Wo2.2-5.5, FeO/MnO=30±3, n=29), Pigeonite (Fs54.0±4.5Wo10.4±5.1, range Fs44.0-58.8Wo6.0-22.6, FeO/MnO=30±3, n=17), High-Ca Pyroxene (Fs30.3±4.5Wo38.0±5.4, range Fs26.2-40.9Wo26.4-43.1, FeO/MnO=28±3, n=10), Calcic Plagioclase (An89.3±1.7, range An83.7-92.2, n=36).

Classification: Achondrite (Eucrite)

Specimens: 21.2 g at UCLA; main mass with Matthew Stream.

Data from:
  MB110
  Table 0
  Line 0:
Date:2018
Mass (g):110
Pieces:1
Class:Eucrite
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):59.5±1.2, 54.0±4.5, 30.3±4.5
Wollastonite (mol%):3.6±0.9, 10.4±5.1, 38.0±5.4
Classifier:D. Sheikh, FSU
Type spec mass (g):21.2
Type spec location:UCLA
Main mass:Matthew Stream
Comments:Submitted by Daniel Sheikh
Institutions
   and collections		 UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
FSU: Department of Geological Sciences, Florida State University, Tallahassee FL 32306-4100, United States (institutional address; updated 16 Dec 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
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Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1059 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)

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