Meteoritical Bulletin: Entry for Northwest Africa 13775

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Northwest Africa 13775

Basic information

Name: Northwest Africa 13775
This is an OFFICIAL meteorite name.
Abbreviation: NWA 13775
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass: 30 g

Classification
history:

Recommended:

Martian (shergottite) [explanation]

This is 1 of 293 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite). [show all]
Search for other: Martian meteorites

Comments:

Approved 28 Mar 2021

Writeup

help

Writeup from MB 110:

Northwest Africa 13775 (NWA 13775)

(Northwest Africa)

Purchased: 2021 Jan

Classification: Martian meteorite (Shergottite)

History: The meteorite was purchased by the main mass holder from a dealer in Temara, Morocco.

Physical characteristics: Many small, light-brownish fragments without fusion crust.

Petrography: The meteorite shows a porphyritic texure of up to 1.3 mm sized strongly zoned olivine phenocrysts set in a groundmass of zoned pigeonite and maskelynite. Olivine often contains magmatic inclusions with radial cracks extending into the host. Minor minerals are small homogeneous olivine, chromite, ilmenite, and pyrrhotite. Contains shock melt veins.

Geochemistry: olivine phenocrysts: Fa_40.9±13.6(Fa_27.0-60.3, FeO/MnO=47±3, n=9); small olivine: Fa_45.7±0.1, FeO/MnO=47±2, n=3; complex zoned pyroxene: Fs_33.0±9.5Wo_18.6±11.7(Fs_23.4-46.8Wo_5.3-43.1, FeO/MnO=29±3, n=8); maskelynite: An_51.3±2.6Ab_46.8±2.3Or_1.9±0.3(An_47.8-55.0Ab_43.6-49.9Or_1.3-2.3, n=8)

Classification: Martian; olivine-phyric shergottite

Data from:
  MB110
  Table 0
  Line 0:

Place of purchase:	Temara, Morocco
Date:	P 2021 Jan
Mass (g):	30
Pieces:	many
Class:	Martian (shergottite)
Shock stage:	high
Weathering grade:	moderate
Fayalite (mol%):	40.9; 45.7
Ferrosilite (mol%):	33.0
Wollastonite (mol%):	18.6
Classifier:	A. Greshake, MNB
Type spec mass (g):	6.8
Type spec location:	MNB
Main mass:	Said Yousfi
Comments:	Submitted by Ansgar Greshake

Institutions
and collections

MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)

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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Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Said Yousfi
Public domain photographs:
Ansgar Greshake

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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