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Swayyah 002
Basic information Name: Swayyah 002
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2019
Country: Western Sahara
Mass:help 4.52 kg
Classification
  history:
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 195 approved meteorites (plus 1 unapproved name) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 11 Oct 2019
Writeuphelp
Writeup from MB 108:

Swayyah 002        26.707°N, 8.936°W

Saguia el Hamra, Western Sahara

Purchased: 2019 Feb

Classification: Martian meteorite (Shergottite)

History: Multiple stones (the largest weighing 3092 g) were found in early 2019. The majority of this material was purchased in February 2019 by Darryl Pitt from a Mauritanian dealer. One stone (100.34 g) was also purchased by Eric Twelker in February 2019 and two stones (total 98 g) were purchased by Ben Hoefnagels from Aziz Habibi in May 2019.Finally a stone (92.6 g) was acquired in October 2019 by Luc Labenne from a dealer in Zagora, Morocco

Physical characteristics: The stones lack fusion crust but in parts exhibit a desert weathering patina coating. Interiors have a mottled greenish-gray appearance.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Diabasic texture (mean grainsize 0.7 mm). Composed mainly of zoned clinopyroxene and maskelynite with accessory Cr-Ti-bearing magnetite, ilmenite, chlorapatite, pyrrhotite and rare baddeleyite. Grains of Fe-Ti oxides and clinopyroxene exhibit minor orange staining, and there are some thin veinlets of secondary calcite. Sparse glassy shock melt pockets are present.

Geochemistry: Subcalcic augite (Fs21.4-22.1Wo35.4-33.6, FeO/MnO = 26-28, N = 3), pigeonite (Fs30.8Wo13.1, FeO/MnO = 28), ferroan pigeonite (Fs50.8-63.3Wo17.2-12.8, FeO/MnO = 35-38, N = 4), maskelynite (An57.8Or1.0). Bulk composition (A. Falster, MMGM): analyses by X-ray fluorescence spectrometry on cut surfaces of three specimens gave (in wt.%): SiO2 48.56, TiO2 1.15, Al2O3 12.00, Cr2O3 0.11, FeO 15.68, MnO 0.45, MgO 6.47, CaO 12.84, K2O 0.03, P2O5 1.18.

Classification: Shergottite (diabasic).

Specimens: 31.9 g including two polished thin sections at UWB; remainder with DPitt, E. Twelker and B. Hoefnagels.

Data from:
  MB108
  Table 0
  Line 0:
State/Prov/County:Saguia el Hamra
Place of purchase:Mauritania
Date:P 2019 Feb
Latitude:26.707°N
Longitude:8.936°W
Mass (g):4523
Pieces:4
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low to m
Ferrosilite (mol%):21.4-22.1; 50.8-63.3
Wollastonite (mol%):17.2-12.8; 35.4-33.6
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):31.9
Type spec location:UWB
Main mass:DPitt/E. Twelker
Comments:Work names MVCH 467, MVCH 468, MVCH 470, ET19-1 and BH203; submitted by A. Irving
Institutions
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
Labenne: 23, rue de Esperance, 75013 Paris, France; Website (private address; updated 29 Aug 2012)
Twelker: Eric Twelker, P.O. Box 844, Port Townsend, WA 98368, United States; Website (private address; updated 1 Dec 2014)
MMGM: Maine Mineral and Gem Museum, PO Box 500, 99 Main St., Bethel, ME 04217, United States (institutional address; updated 30 Aug 2014)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
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Geography:

Western Sahara
Coordinates:
     Recommended::   (26° 42' 25"N, 8° 56' 10"W)

Statistics:
     This is 1 of 84 approved meteorites from Saguia el Hamra, Western Sahara (plus 1 unapproved name)
     This is 1 of 206 approved meteorites from Western Sahara (plus 20 unapproved names)
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