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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:
Meteoritical Bulletin:  MB 110  (2022)  Lunar (basalt)
Recommended:  Lunar (basalt)    [explanation]

This is 1 of 29 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 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:

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

Statistics:
     This is 1 of 281 approved meteorites from Western Sahara (plus 20 unapproved names)
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