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Northwest Africa 13188
Basic information Name: Northwest Africa 13188
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13188
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 646 g
Classification
  history:
Recommended:  Achondrite-ung    [explanation]

This is 1 of 99 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 21 Mar 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13188 (NWA 13188)

(Northwest Africa)

Purchased: 2018 Jun

Classification: Ungrouped achondrite

Physical characteristics: Partially crusted stone

Petrography: (J. Gattacceca, CEREGE) Igneous rock with overall subopthitic texture. Main minerals are pyroxene (300 μm) and plagioclase (to 400 μm). Abundant vesicles 250 μm in diameter. FeTi oxides (~0.5 vol%) as blebs adjacent to vesicles, or acicular and dendritic within the fine-grained intergrowths of plagioclase and pyroxene that are found around plagioclase crystals. No metal was found. Modal abundances from point counting (vol%): plagioclase 49%, pyroxene 26%, vesicles 8%, fine-grained intergrowth of plagiocalse and pyroxene 18%.

Geochemistry: Low-Ca pyroxene Fs25.4±6.6Wo8.3±0.7, FeO/MnO=42.2±4.3 (n=5). Ca pyroxene Fs18.4±4.2Wo38.1±0.8, FeO/MnO=60.3±11.7 (n=3). Plagioclase An70.1±4.7Ab29.0±4.4Or0.9±0.3 (n=5). The bulk sample has a basaltic composition with 52.3%wt SiO2; 8.0%wt MgO; 10.1 %wt FeO; 10.5%wt CaO; 14.1 %wt Al2O3 (ICP-OES, V. Debaille, ULB), and is enriched in incompatible trace elements: (La/Sm)N=2, (La/Lu)N=3.5 (ICP-MS, V. Debaille, ULB). Oxygen isotopic composition (J. Gattacceca, C. Sonzogni, CEREGE) from analysis of one acid-washed 1.5 mg aliquot of a powdered 128 mg bulk sample is δ17O=3.93‰, δ18O=7.81‰ , Δ17O=-0.16‰ (linearized, slope 0.5247, analytical uncertainties 0.08‰, 0.12‰, 0.03‰ respectively).

Classification: Achondrite-ung. The oxygen isotopic composition and mineral chemistry (basaltic composition enriched in incompatible elements) set this rock apart from other achondrites.

Specimens: Type specimen at CEREGE. Main mass with A. Jambon.

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2018 Jun
Mass (g):646
Pieces:1
Class:Achondrite-ung
Ferrosilite (mol%):25.4±6.6 (n=5)
Wollastonite (mol%):8.3±0.7
Magnetic suscept.:3.68
Classifier:J. Gattacceca, CEREGE
Type spec mass (g):24.4
Type spec location:CEREGE
Main mass:Albert Jambon
Comments:work name BA18-01; submitted by Jérôme Gattacceca
Plots: O isotopes:  
Institutions
   and collections
CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 29 Oct 2018)
ULB: Université libre de Bruxelles Avenue Franklin Roosevelt 50 - 1050 Bruxelles, Belgium (institutional address; updated 27 Sep 2018)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
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Photos:
CreditPhotos
Public domain photographs:
Jerome Gattacceca               
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7374 approved meteorites from (Northwest Africa) (plus 1957 unapproved names)

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