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Aridal 019
Basic information Name: Aridal 019
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2022
Country: Western Sahara
Mass:help 1368 g
Classification
  history:
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 288 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 20 Jun 2022
Writeuphelp
Writeup from MB 111:

Aridal 019        25.747°N, 13.478°W

Rio de Oro, Western Sahara

Purchased: 2022 Feb

Classification: Lunar meteorite (feldspathic breccia)

History: Five similar-appearing stones were found together.

Physical characteristics: One large stone (1207 g) plus four smaller stones (total 161 g). All stones exhibit a brown, knobby exterior with light desert patina; cut interior surfaces reveal small white to beige clasts within a fine grained tan matrix.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Fine grained breccia composed of mineral clasts of anorthite, altered olivine, low-Ca pyroxene, pigeonite and augite in a very fine grained matrix containing low-Ti, high-Al chromite, ilmenite and minor secondary barite. Most olivine has been completely altered to an iddingsite-like hydrous phase with low oxide sums and elevated FeO/MnO ratios; this is very similar to the altered olivine documented in paired lunar meteorites Tisserlitine 001 and NWA 13621.

Geochemistry: Anorthite (An95.9-97.7Or0.1, N = 3), low-Ca pyroxene (Fs28.5-35.0Wo2.0-4.5, FeO/MnO = 60-71, N = 4), pigeonite (Fs31.0-31.9Wo8.1-8.9, FeO/MnO = 57-60), augite (Fs20.1-21.9Wo39.6-35.1, FeO/MnO = 51-53, N = 2), unaltered olivine (Fa39.3, FeO/MnO = 92, N = 1).

Classification: Lunar (feldspathic breccia). Although this material has some mineralogical similarites to Tisserlitine 001 and NWA 13621 found in eastern Mali, these stones have a different external appearance and the find site is reliably at a location much farther to the west.

Specimens: 22.4 g including one polished endcut at UWB; remainder with Mr. T. Boudreaux.

Data from:
  MB111
  Table 0
  Line 0:
State/Prov/County:Rio de Oro
Place of purchase:Zagora
Date:P 2022 Feb
Latitude:25.747°N
Longitude:13.478°W
Mass (g):1368
Pieces:5
Class:Lunar (feldsp. breccia)
Shock stage:low
Weathering grade:high
Fayalite (mol%):39.3±0.0
Ferrosilite (mol%):28.5-35.0;31.0-31.9; 20.1-21.9
Wollastonite (mol%):2.0-4.5; 8.1-8.5; 39.6-35.1
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):22.4
Type spec location:UWB
Main mass:T. Boudreaux
Comments:Work name RC158.1; 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)
Boudreaux: Terry Boudreaux, Illinois, United States (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
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Geography:

Western Sahara
Coordinates:
     Recommended::   (25° 44' 49"N, 13° 28' 41"W)

Statistics:
     This is 1 of 46 approved meteorites from Rio de Oro, Western Sahara
     This is 1 of 261 approved meteorites from Western Sahara (plus 20 unapproved names)
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