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Gadamis 005
Basic information Name: Gadamis 005
     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 10 kg
Classification
  history:
Meteoritical Bulletin:  MB 111  (2023)  Lunar (anorth)
Recommended:  Lunar (anorth)    [explanation]

This is 1 of 83 approved meteorites classified as Lunar (anorth).   [show all]
Search for other: Lunar meteorites
Comments: Approved 12 Nov 2022
Writeuphelp
Writeup from MB 111:

Gadamis 005        30.284, 11.005

Ghadamis, Libya

Purchased: 2022

Classification: Lunar meteorite (anorth)

History: This meteorite was found in Libya at the same location as Gadamis 002, 003 and 004, purchased by Mark Lyon in 2022.

Physical characteristics: Single stone with patches of dark fusion crust and smooth, light green-colored patches. 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: (A. Ross, UNM) Plagioclase An96.6±0.7Ab3.1±0.7Or0.2±0.1, n=6; olivine Fa30.7±1.7, Fe/Mn=109±10, n=5; pigeonite Fs27.8±5.2Wo7.2±8.0, Fe/Mn=53±3, n=3; augite Fs15.3±4.7Wo39.4±5.1, Fe/Mn=44±9, n=3.

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, Gadamis 003, and Gadamis 004.

Specimens: 20.5 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
Place of purchase:Northwest Africa
Date:P 2022
Latitude:30.284
Longitude:11.005
Mass (g):10000
Pieces:1
Class:Lunar (anorth)
Shock stage:high
Weathering grade:low
Fayalite (mol%):30.7±1.7
Ferrosilite (mol%):27.8±5.2, 15.3±4.7
Wollastonite (mol%):7.2±8.0, 39.4±5.1
Classifier:C. Agee, UNM
Type spec mass (g):20.5
Type spec location:UNM
Main mass:Marl Lyon
Comments:Field name ML-42; 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 Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?
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Geography:

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

Statistics:
     This is 1 of 33 approved meteorites from Ghadamis, Libya (plus 2 unapproved names)
     This is 1 of 1559 approved meteorites from Libya (plus 25 unapproved names) (plus 2 impact craters)
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