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Northwest Africa 13688
Basic information Name: Northwest Africa 13688
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13688
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 121.3 g
Recommended:  L6    [explanation]

This is 1 of 11509 approved meteorites (plus 6 unapproved names) classified as L6.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 21 Feb 2021
Writeup from MB 110:

Northwest Africa 13688 (NWA 13688)

(Northwest Africa)

Find: 2016

Classification: Ordinary chondrite (L6)

History: The specimen was bought from Zs. Kereszty in 2017.

Physical characteristics: Originally an individual pyramidal-shaped (5 × 5 × 4 cm) brown stone (129.2 g) without fusion crust. Cut surface reveals grey lithology with several limonitic patches around troilite, metal and opaque veins.

Petrography: (D. Rezes, CSFK) Almost all of the metal and troilite phases are affected by oxidation, without the alteration of silicate phases. Approximately half of the silicates are stained by limonitic patches. There are just three thin (50 µm) shock veins in the section. Mosaicism of olivine grains and several chromite-plagioclase assemblages are observed in the sample. Both sparse relict chondrules and polygonal crystals with triple junctions are presented. Plagioclase crystals have interconnected network up to 1 mm.

Geochemistry: (D. Rezes, CSFK) Olivine Fa25.4±0.2, Fe/Mn=51±9, N=10; orthopyroxene Fs22.1±0.4Wo1.9±0.2, Fe/Mn=30±2, N=9; plagioclase Or7.9±1.8Ab79.6±3.1An12.5±1.6, N=12; CaO-content in orthopyroxenes 1.0±0.1 wt% (0.8-1.2 wt%; N=9)

Classification: Ordinary chondrite (L6), shock stage S4, weathering grade W3. CaO-content of orthopyroxenes and the presence of several relict chondrules along with equilibrated polygonal crystals with triple junctions indicate a highly recrystallized type 6 chondrite.

Specimens: 58.5 g on deposit at CSFK, D. Rezes holds the main mass including one polished thin section.

Data from:
  Table 0
  Line 0:
Mass (g):121.3
Shock stage:S4
Weathering grade:W3
Fayalite (mol%):25.4±0.2 (N=10)
Ferrosilite (mol%):22.1±0.4 (N=9)
Wollastonite (mol%):1.9±0.2 (N=9)
Classifier:D. Rezes, CSFK
Type spec mass (g):58.5
Type spec location:CSFK
Main mass:D. Rezes
Comments:Work name: RDNWAx2; submitted by Daniel Rezes
   and collections
CSFK: Research Center for Astronomy and Earth Sciences, H-1121 Budapest, Konkoly Thege Miklós út 15-17.l Hungary, Hungary (institutional address; updated 7 Apr 2015)
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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Public domain photographs:
Daniel Rezes            

     This is 1 of 7655 approved meteorites from (Northwest Africa) (plus 1972 unapproved names)

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