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Northwest Africa 13695
Basic information Name: Northwest Africa 13695
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13695
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 728 g
Recommended:  L5    [explanation]

This is 1 of 7220 approved meteorites (plus 4 unapproved names) classified as L5.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 31 Jan 2021
Writeup from MB 110:

Northwest Africa 13695 (NWA 13695)

(Northwest Africa)

Purchased: 22 June 2019

Classification: Ordinary chondrite (L5)

History: A 727.7 g single fragment was purchased by Andries Goedhart from a dealer at the Ensisheim show (22 June 2019). Seller: Adrian Contreras Gomes Adrian Contreras Gomes bought the stone on 6 September 2018 from Hmad Ait Hssain in El Aaiun, Western Sahara.

Physical characteristics: The color of the meteorite is pale brown. The stone is very rusty, partly surrounded by fusion crust.

Petrography (I. Baziotis; S. Xydous AUA): Textural observations of the thin section in both transmitted and reflected light showed that it is chondritic. It contains porphyritic and non-porphyritic chondrules, both type II (Mg/(Mg+Fe)<90). The barred olivine chondrules have irregular shape with non-discernible edges. The groundmass consists of olivine, low-Ca pyroxene (orthopyroxene), high-Ca pyroxene, plagioclase, metal, oxides (chromites), troilite, and phosphates (merrillite and Cl-apatite). The olivines and plagioclase show sharp extinction, no undulatory features, suggesting shock stage S1.

Geochemistry: Olivine Fa25.2±1.0 (n=31); orthopyroxene Fs21.6±0.2Wo1.25±0.20 (n=21); High-Ca pyroxene Fs9.2±1.6Wo44.7±1.2 (n=20); Sulfide [Ni average 0.45 (n=8)]. Metal: Kamacite with Ni in the range 5.74-10.1 wt% (n=6), and taenite with Ni in the range 16.3-23.3 (n=6). Phosphates occur as merrilite with Mg# in the range 83-90 (n=3) and Cl-apatites with Cl in the range 3.96-5.31 wt% and F in the range 0.41-0.69 wt% (n=9). Plagioclase Ab81.1-84.6 (n=16).

Classification: Ordinary chondrite (L5, S1, W2)

Specimens: 32.55 g at NHMV

Data from:
  Table 0
  Line 0:
Date:P 22 June 2019
Mass (g):728
Shock stage:S1
Weathering grade:W2
Fayalite (mol%):25.2±1.0 (N=31)
Ferrosilite (mol%):21.6±0.2 (n=21)
Wollastonite (mol%):1.25±0.2
Magnetic suscept.:4.48
Classifier:I. Baziotis and S. Xydous, AUA
Type spec mass (g):32.55
Type spec location:NHMV
Main mass:Andries Goedhart
Comments:Submitted by Ioannis Baziotis-Stamatios Xydous
   and collections
NHMV: Naturhistorisches Museum, Burgring 7, 1010 Wien, Austria, Austria; Website (institutional address; updated 18 Jan 2019)
AUA: Department of Natural Resources Management and Agricultural Engineering Agricultural Univ. of Athens Iera Odos 75, 11855 Athens, Greece (institutional address; updated 10 Mar 2018)
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
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     This is 1 of 7912 approved meteorites from (Northwest Africa) (plus 1974 unapproved names)

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