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Touat 005
Basic information Name: Touat 005
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2020
Country: Algeria
Mass:help 3.71 kg
Classification
  history:
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 208 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 19 Nov 2020
Writeuphelp
Writeup from MB 109:

Touat 005        27.747222, -1.369722

Adrar, Algeria

Find: 2020

Classification: Lunar meteorite (feldspathic breccia)

History: These two stones were found by meteorite hunters driving off-road between Tabelbala, Algeria, and the Erg Chech 002 find locality. Nearest towns to this find are Adrar and Tamentit, Algeria.

Physical characteristics: Two stones, identical in appearance, (2035 and 1675 g) were found together. This is a fragmental breccia with white plagioclase megacrysts and lithic clasts set in a dark shocked matrix. Plagioclase megacrysts are up to two centimeters in length and are translucent in thinly sliced slabs. No fusion crust is present.

Petrography: (C. Agee, UNM) Electron microprobe analysis and imaging reveals a fragmental breccia with large, sometimes euhedral anorthite crystals (megacrysts). The megacrysts appear to be shock-mosaicized or recrystallized with a significant amount of dark and light inclusions present, some of the observed inclusion veining in the megacysts is possibly maskelynite. The compositions of the plagioclase megacrysts are slightly more anorthitic than the groundmass plagioclase fragments, although there is compositional overlap between the two that is within microprobe error. This is possibly a monomict breccia since the section analyzed had only one coherent population of pyroxenes and olivines that appear to be related by equilibrium igneous crystallization. The olivine and pyroxene compositions are similar to that in ferroan anorthosites. Shock melt veins with vesicles were observed. Minor opaque phases are ilmenite and chromite.

Geochemistry: (C. Agee, UNM) Plagioclase megacrysts An97.2±0.7Ab2.6±0.3Or0.2±0.1, n=6; groundmass plagioclase An96.5±0.3Ab3.2±0.3Or0.2±0.1, n=6; low-Ca pyroxene Fs28.2±5.9Wo5.6±3.1, Fe/Mn=59±6, n=6; augite Fs18.7±0.4Wo43.2±1.5, Fe/Mn=48±1, n=2; olivine Fa36.7±10.1, Fe/Mn=95±3, n=9; shock melt vein SiO2=43.6±0.4, Al2O3=31.1±0.8, FeO=3.7±0.6, MgO=3.3±0.5, MnO=0.05±0.02, CaO=17.3±0.1, Na2O=0.32±0.05 all wt%, n=3.

Classification: Lunar feldspathic breccia with plagioclase megacrysts. Mafic minerals similar in composition to that present in ferroan anorthosites.

Specimens: 25.8 g on deposit at UNM, Mark Lyon holds the main masses.

Data from:
  MB109
  Table 0
  Line 0:
State/Prov/County:Adrar
Date:2020
Latitude:27.747222
Longitude:-1.369722
Mass (g):3710
Pieces:2
Class:Lunar (feldsp. breccia)
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):36.7±10.1
Ferrosilite (mol%):28.2±5.9, 18.7±0.4
Wollastonite (mol%):5.6±3.1, 43.2±1.5
Classifier:C. Agee, UNM
Type spec mass (g):25.8
Type spec location:UNM
Main mass:Mark Lyon
Comments:Field name ML-1; submitted by C. Agee, UNM
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. 109, in preparation (2020)
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Geography:

Algeria
Coordinates:
     Recommended::   (27° 44' 50"N, 1° 22' 11"W)

Statistics:
     This is 1 of 148 approved meteorites from Adrar, Algeria (plus 1 unapproved name)
     This is 1 of 1034 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)
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