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Northwest Africa 13170
Basic information Name: Northwest Africa 13170
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13170
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 70 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 17 Feb 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13170 (NWA 13170)

(Northwest Africa)

Purchased: May 2015

Classification: Ungrouped achondrite

History: Bought in Erfoud, Morocco, in May 2015.

Physical characteristics: A dark-brown stone. Cut surface reveals a homogeneous dark interior.

Petrography: (J. Gattacceca, CEREGE) Equilibrated equigranular texture with triple junctions. Main mineral are olivine and pyroxene (grain size 200 μm), plagioclase (grain size 100 μm, 17 vol%), FeS (8 vol%, well preserved, grain size 100 μm). Accessory metal (mostly replaced by weathering products), chromite. No chondrule visible in the 1 cm2 section.

Geochemistry: Olivine Fa30.8±0.3, CaO 0.08±0.01 wt%, FeO/MnO=81.4±8.9 (N=7). Ca-pyroxene Fs10.4±0.8Wo44.3±1.4 (N=5). No low-Ca pyroxene was found in the section. Plagioclase An30.4±0.8Ab66.7±0.8Or2.9±0.1 (N=4). Chromite Cr/(Cr+Al) = 0.76 (N=1). Oxygen isotopic composition (J. Gattacceca, C. Sonzogni, CEREGE) from analysis of one acid-washed 1.5 mg aliquot of a powdered 185 mg bulk sample is δ17O=-2.28‰, δ18O=0.97‰, Δ17O=-2.79‰ (linearized, slope 0.5247, analytical uncertainties 0.08‰, 0.12‰, 0.03‰ respectively). Magnetic susceptibility log χ (× 10-9 m3/kg) = 3.68.

Classification: Achondrite-ungrouped. The oxygen isotopic composition is far removed from other achondrite groups. The mineralogy and mineral composition are similar to NWA 10503, but oxygen isotopic composition is different.

Specimens: 15 g and a polished section at CEREGE. Main mass with Luc Labenne.

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P May 2015
Mass (g):70
Pieces:1
Class:Achondrite-ung
Weathering grade:strong
Fayalite (mol%):30.8±0.3 (N=7)
Magnetic suscept.:3.68
Classifier:J. Gattacceca, H. Pourkhorsandi, CEREGE
Type spec mass (g):15
Type spec location:CEREGE
Main mass:Labenne Luc
Comments:work name LL2015-50; 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)
Labenne: 23, rue de Esperance, 75013 Paris, France; Website (private address; updated 29 Aug 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

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

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