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Gadamis 004
Basic information Name: Gadamis 004
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2022
Country: Libya
Mass:help 12.66 kg
Classification
  history:
Recommended:  Lunar (anorth)    [explanation]

This is 1 of 78 approved meteorites classified as Lunar (anorth).   [show all]
Search for other: Lunar meteorites
Comments: Approved 19 Mar 2022
Writeuphelp
Writeup from MB 111:

Gadamis 004        30.284°N, 11.005°E

Ghadamis, Libya

Purchased: 2022

Classification: Lunar meteorite (anorth)

History: This meteorite was found in Libya at the same location as Gadamis 002 and 003, purchased by Mark Lyon in 2022.

Physical characteristics: Single stone with patches of dark fusion crust and smooth, light green-colored patches. One side is more irregular with a weathered surface that was fractured at some time in the past. Polished sawcut surfaces reveal cm-size clasts of anorthosite bounded by darker, fine-grained, cataclastic zones.

Petrography: (C. Agee, UNM) Microprobe analysis reveals a significantly brecciated, cataclastic anorthitic plagioclase host making up 98-99% of this meteorite. Poikiolitically enclosed in the plagioclase are sparse, very small olivine and pyroxene blebs (most in the range 5-10 μm). Larger pyroxene grains are scarce with two larger grains in size range of 300 μm observed in the microprobe mount. Together, olivine and pyroxene make up a total of ~1-2% of this meteorite.

Geochemistry: (C. Agee, UNM) Plagioclase An96.0±0.1Ab3.8±0.1Or0.2±0.1, n=4; olivine Fa38.9±1.0, Fe/Mn=105±3, n=4; pigeonite Fs34.0±4.8Wo5.4±2.3, Fe/Mn=60±3, n=4; augite Fs5.7Wo46.1, Fe/Mn=32.

Classification: Lunar ferroan anorthosite, cataclastic. Olivine, pigeonite and plagioclase compositional values plot within the FAN suite field (after Warren, 1993). The very high anorthite content (98-99%) and cataclastic texture is similar to Apollo 16 cataclastic FANs. Paired with Gadamis 002 and Gadamis 003.

Specimens: 21 g on deposit at UNM, Mark Lyon holds the main mass.

Bibliography:
  • Warren P.H. (1993) A concise compilation of petrologic information on possibly pristine nonmare Moon rocks. American Mineralogist 78 (3-4), 360-376. (link)
Data from:
  MB111
  Table 0
  Line 0:
State/Prov/County:Ghadamis
Date:P 2022
Latitude:30.284°N
Longitude:11.005°E
Mass (g):12.66 kg
Pieces:1
Class:Lunar (anorth)
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):38.9±1.0
Ferrosilite (mol%):34.0±4.8, 5.7
Wollastonite (mol%):5.4±2.3, 46.1
Classifier:C. Agee, UNM
Type spec mass (g):21
Type spec location:UNM
Main mass:Mark Lyon
Comments:Fieldname ML-26; 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 Meteoritical Bulletin, no. 111, in preparation (2022)
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Geography:

Libya
Coordinates:
     Recommended::   (30° 17' 2"N, 11° 0' 18"E)

Statistics:
     This is 1 of 29 approved meteorites from Ghadamis, Libya (plus 2 unapproved names)
     This is 1 of 1529 approved meteorites from Libya (plus 23 unapproved names) (plus 2 impact craters)
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