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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 565 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 Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1232 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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