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Swayyah 004
Basic information Name: Swayyah 004
     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 1700 g
Classification
  history:
Recommended:  Lunar (basalt)    [explanation]

This is 1 of 22 approved meteorites classified as Lunar (basalt).   [show all]
Search for other: Lunar meteorites
Comments: Approved 24 Jul 2021
Writeuphelp
Writeup from MB 110:

Swayyah 004        26.753751, -8.864520

Western Sahara

Find: 2019

Classification: Lunar meteorite (basalt)

History: Purchased by Jay Piatek in 2021 from a meteorite dealer in Mauritania. Found by a meteorite hunter win the region of Alaug Alkabli, Western Sahara, about 75 km from Almahbas.

Physical characteristics: Single stone, irregular pitted surface with about 20% preserved smooth black fusion crust, the rest of the exterior is sand-blasted from desert weathering. Some orange caliche coating is also present. A freshly exposed surface from the deposit sample chip reveals a medium to fine-grained texture of light and dark colored mineral phases. Ubiquitous shiny transparent-colorless maskelynite glass is macroscopically visible, as are scattered shiny black shock melt veinlets. Unbrecciated.

Petrography: (C. Agee, UNM) Backscattered electron images shown igneous-zoned olivines and pyroxenes most in the size range of 500-1000 μm. Maskelynite makes up approximately 25% of the modal mineralogy, ilmenite ~3%, minor troilite and silica observed.

Geochemistry: (A. Ross and C. Agee, UNM) Olivine Fa56.1±11.2, Fe/Mn=104±8, n=10; pigeonite Fs36.3±4.9Wo13.6±3.4, Fe/Mn=59±5, n=19; augite Fs24.7±3.3Wo32.7±0.8, Fe/Mn=53±5, n=5; subcalcic ferroaugite Fs53.1±5.7Wo22.1±4.6, Fe/Mn=73±3, n=6, maskelynite An88.8±2.8Ab10.7±2.8, n=12. Displayed in the pyroxene quadrilateral, augite and pigeonite show Fe-enrichment trends that converge into subcalcic ferroaugite.

Classification: Lunar (mare basalt)

Specimens: 37.5 g including a probe mount on deposit at UNM, Jay Piatek holds the main mass.

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:2019
Latitude:26.753751
Longitude:-8.864520
Mass (g):1.7 kg
Pieces:1
Class:Lunar (basalt)
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):56.1±11.2
Ferrosilite (mol%):36.3±4.9, 24.7±3.3, 53.1±5.7
Wollastonite (mol%):13.6±3.4, 32.7±0.8, 22.1±4.6
Classifier:C. Agee, UNM
Type spec mass (g):37.5
Type spec location:UNM
Main mass:Jay Piatek
Comments:Submitted by C. Agee
Institutions
   and collections		 UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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Geography:

Western Sahara
Coordinates:
     Recommended::   (26° 45' 14"N, 8° 51' 52"W)

Statistics:
     This is 1 of 254 approved meteorites from Western Sahara (plus 20 unapproved names)
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