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Dayr al Aswad
Basic information Name: Dayr al Aswad
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2019
Country: Egypt
Mass:help 1200 g
Classification
  history:
Recommended:  R5    [explanation]

This is 1 of 38 approved meteorites classified as R5.   [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 4-7)
Comments: Approved 11 Nov 2021
Writeuphelp
Writeup from MB 110:

Dayr al Aswad        30°46’10.79’’N, 28°06’30.7’’E

Marsa Matruh, Egypt

Find: 2019 Aug 01

Classification: Rumuruti chondrite (R5)

History: The meteorite was found by Mr. Amr Khaled in August 2019 during a field trip to the North Western Egyptian desert.

Physical characteristics: Ten several cm sized dark brownish fragments lacking fusion crust were recovered.

Petrography: The meteorite displays a brownish unbrecciated interior composed of well-formed porphyritic and barred chondrules (mean diameter about 400 µm) set in a fine grained matrix dominated by ferroan olivine. More minor phases include low-Ca pyroxene, Ca-pyroxene, sodic plagioclase, pentlandite, and low-Ti chromite; no metal has been detected. Olivine and pyroxene are compositionally equilibrated.

Geochemistry: olivine: Fa37.8±0.4 (Fa37.3-38.4, n=12); low-Ca pyroxene: Fs29.4±0.6Wo1.5±0.1 (Fs28.4-30.1Wo1.4-1.6, n=8); Ca-pyroxene: Fs9.9±0.4Wo46.6±0.6 (Fs9.4-10.3Wo45.7-47.6, n=8); feldspar: An13.1-14.7Ab81.0-83.2Or3.5-4.2, n=3

Data from:
  MB110
  Table 0
  Line 0:
State/Prov/County:Marsa Matruh
Date:2019 Aug 01
Latitude:30°46'10.79''N
Longitude:28°06'30.7''E
Mass (g):1200
Pieces:10
Class:R5
Shock stage:S1
Weathering grade:moderate
Fayalite (mol%):37.8
Ferrosilite (mol%):29.4; 9.9
Wollastonite (mol%):1.5; 46.6
Magnetic suscept.:2.94
Classifier:A. Greshake, MNB
Type spec mass (g):37.6
Type spec location:MNB
Main mass:Amr Khaled
Finder:Amr Khaled
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 Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
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Geography:

Egypt
Coordinates:
     Recommended::   (30° 46' 11"N, 28° 6' 31"E)

Statistics:
     This is 1 of 10 approved meteorites from Marsa Matruh, Egypt
     This is 1 of 108 approved meteorites from Egypt (plus 12 unapproved names) (plus 1 impact crater)
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Synonymshelp: Dayr al Aswad 001 (First meteorite in DCA)

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