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La'gad 003
Basic information Name: La'gad 003
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: unknown
Country: Western Sahara
Mass:help 27.25 kg
Classification
  history:
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 174 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 22 Apr 2019
Writeuphelp
Writeup from MB 108:

La’gad 003        27.606°N, 8.761°W

Saguia el Hamra, Western Sahara

Find: 2015

Classification: Lunar meteorite (feldspathic breccia)

History: Found in 2015 by nomads on a small hill named Grarat-Zawi, and purchased by Darryl Pitt on behalf of MMGM from Mauritanian dealers in the period August-October 2015.

Physical characteristics: A single, very large stone (27.249 kg) found as a group of many pieces which fit together (but with several missing pieces). The specimen lacks fusion crust, but individual pieces have thin coatings of light-brown weathering products. Fresh interiors exhibit angular, whitish clasts within a dark-gray matrix.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed predominantly of mineral clasts plus rare glass clasts and basalt clasts in a finer grained, partly vesicular matrix. Minerals are anorthite, olivine, pigeonite, orthopyroxene, exsolved pigeonite, subcalcic augite, Al-rich chromite, ilmenite and baddeleyite. Minor amounts of secondary calcite and barite are present.

Geochemistry: Olivine (Fa30.0-52.6, FeO/MnO = 84-110, N = 4), pigeonite (Fs28.2-38.2Wo9.8-14.7, FeO/MnO = 50-54, N = 3), orthopyroxene (Fs19.3Wo4.5, FeO/MnO = 57), subcalcic augite (Fs49.6Wo28.3, FeO/MnO = 59), plagioclase (An95.2-97.1Or0.1-0.2, N = 3). Bulk composition (R. Korotev, WUSL) INAA of 10 subsamples from different portions of the reassmbled mass gave the following mean abundances: (in wt.%) FeO 5.95±0.88, Na2O 0.34±0.02, BaO 0.51; (in ppm) Sc 13.6±2.6, Cr 930±210, Ni 140±160, La 2.3±0.6, Sm 1.0±0.2, Eu 0.75±0.06, Yb 0.85±0.14, Lu 0.13±0.02, Hf 0.65±0.13, Th 0.37±0.11.

Classification: Lunar (feldspathic regolith breccia). Based on closely similar bulk chemical compositional data (determined by Dr. R. Korotev at WUSL utilizing the same INAA methods), it is likely that the NWA 10509 stone and the material classified as NWA 10798 are paired portions of the same disaggregated meteorite. Another lunar feldspathic meteorite from a different location in the same dense collection area received the name La’gad, but analyses by Dr. Korotev demonstrate that the La’gad stones differ from the material described here, especially in having much higher (by a factor of 6) abundances of Th and other lithophile elements.

Specimens: 33.21 g including two polished endcuts at UWB; main mass at MMGM.

Data from:
  MB108
  Table 0
  Line 0:
State/Prov/County:Saguia el Hamra
Place of purchase:Mauritania
Date:2015
Latitude:27.606°N
Longitude:8.761°W
Mass (g):27249
Pieces:many
Class:Lunar (feldsp. breccia)
Shock stage:low
Fayalite (mol%):30.0-52.6
Ferrosilite (mol%):19.3; 28.2-38.2; 49.6
Wollastonite (mol%):4.5; 9.8-14.7; 28.3
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):33.21
Type spec location:UWB
Main mass:MMGM
Comments:MCVICH 005/MVCH 55; 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)
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::   (27° 36' 22"N, 8° 45' 40"W)

Statistics:
     This is 1 of 82 approved meteorites from Saguia el Hamra, Western Sahara (plus 1 unapproved name)
     This is 1 of 204 approved meteorites from Western Sahara (plus 20 unapproved names)
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