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Galb Inal
Basic information Name: Galb Inal
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2011
Country: Mauritania
Mass:help 4.05 kg
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  Lunar
Recommended:  Lunar    [explanation]

This is 1 of 83 approved meteorites classified as Lunar.   [show all]
Search for other: Lunar meteorites
Comments: Approved 14 May 2016
Writeuphelp
Writeup from MB 105:

Galb Inal        21°18’N, 14°58’W

Inchiri, Mauritania

Find: Jan 2011

Classification: Lunar meteorite

History: (H. Chennaoui Aoudjehane, A. Jambon) Found in 2011 by nomads, in a sandy area close to the village of Inal, Mauritania, south of Tichla. The stone was found north of the railway and south of the frontier.  The stone was given the provisional name "Northwest Africa 7173" in Jan 2012, prior to documentation of the find location.

Physical characteristics: A 4 kg crust-free and minimally weathered stone, broken in two pieces. The black lustered stone has up to centimeter-sized white lithic clasts. The surface is sand blasted. Magnetic susceptibility (UPVI): log χ (× 10-9 m3/kg)= 3.93.

Petrography: (A. Jambon, O. Boudouma, UPVI) Feldspathic breccia with a significant melt matrix containing petrographically diverse areas. Lithic (ferro anorthosite, troctolite, spinel troctolite, norite; hedenbergite-fayalite-silica; rare clasts of silica associated with K-feldspar) and mineral fragments, shocked clasts, impact melt pockets, devitrified glassy clasts and glass beads. Contains ilmenite, ulvöspinel, chromite, ilmenite, rutile, (F-Cl) apatite. Rare small grains of troilite, kamacite and schreibersite.

Geochemistry: (A. Jambon, UPVI and R. Korotev, WUSL) Orthocumulate olivine Fa19 (FeO/MnO = 90), plagioclase An94, subcalcic augite Fs22Wo30, Pigeonite Fs27-33Wo5-15 and Fs35-4Wo12-19, Ca-pyroxene core, Fs16Wo31 and rim, Fs41Wo14. Bulk composition: XRF (UPVI) INAA (WUSL). INAA : Na2O = 0.45 wt %; Sc = 21 ppm; Cr = 1400 ppm; FeO = 9.5 wt %; Ni = 200 ppm; Sm = 3.5 ppm, Eu = 0.95 and Ba = 250 ppm. XRF wt %: SiO2 = 45.7; Al2O3 = 21.6; Cr2O3 = 0.2; TiO2 = 0.48; FeO = 9.6; MgO = 4.1; CaO = 17.4; K2O = 0.41. Oxygen isotopes (R. Greenwood, OU) : δ17O‰= 3.238, δ18O‰= 6.198, Δ17O‰= 0.015.

Classification: Lunar regolith breccia. Despite a chemical kinship with NWA 2995 the physical aspect and texture do not favor pairing of these two finds.

Specimens: A 21.5 g type specimen is on deposit at UPVI. Anonymous finder holds the main mass.

Data from:
  MB105
  Table 0
  Line 0:
State/Prov/County:Inchiri
Origin or pseudonym:Galb Inal
Date:Jan 2011
Latitude:21°18'N
Longitude:14°58'W
Mass (g):4050
Pieces:2
Class:Lunar
Shock stage:low
Weathering grade:W1
Magnetic suscept.:3.93
Classifier:A. Jambon, R. Korotev, H. Chennaoui Aoudjehane
Type spec mass (g):21.6
Type spec location:UPVI
Main mass:anonymous finder
Finder:Ahl Laamim Aamar
Comments:Ahl Laamim Aamar (17 Boulevard Bahnini, Dakhla, Morocco); submitted by A. Jambon, H. Chennaoui Aoudjehane
Plots: O isotopes:  
Institutions
   and collections
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
UPVI: Université Pierre et Marie Curie (Paris VI),Case 110, 4 Place Jussieu, 75005 Paris, France (institutional address; updated 5 Oct 2014)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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Geography:

Mauritania
Coordinates:
     Recommended::   (21° 18'N, 14° 58'W)

Statistics:
     This is the only approved meteorite from Inchiri, Mauritania
     This is 1 of 101 approved meteorites from Mauritania (plus 1 unapproved name) (plus 2 impact craters)
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Synonymshelp: Galb Inal 001 (NomCom disignated synonym, 31 Mar 2016)
Northwest Africa 7173 (Provisional name replaced 13 May 2016)
NWA 7173 (Provisional name replaced 13 May 2016)

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