Meteoritical Bulletin: Entry for Northwest Africa 13668

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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: 110 g

Classification
history:

Recommended:

Eucrite [explanation]

This is 1 of 569 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 10 Jan 2021

Writeup

help

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 (Fs_59.5±1.2Wo_3.6±0.9, range Fs_56.9-61.5Wo_2.2-5.5, FeO/MnO=30±3, n=29), Pigeonite (Fs_54.0±4.5Wo_10.4±5.1, range Fs_44.0-58.8Wo_6.0-22.6, FeO/MnO=30±3, n=17), High-Ca Pyroxene (Fs_30.3±4.5Wo_38.0±5.4, range Fs_26.2-40.9Wo_26.4-43.1, FeO/MnO=28±3, n=10), Calcic Plagioclase (An_89.3±1.7, range An_83.7-92.2, 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

Algeria

Coordinates:

Unknown.

Statistics:
This is 1 of 1250 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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