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Northwest Africa 8142
Basic information Name: Northwest Africa 8142
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8142
Observed fall: No
Year found: 2010
Country: (Northwest Africa)
Mass:help 12 g
Meteoritical Bulletin:  MB 102  (2013)  L5-melt breccia
Recommended:  L5-melt breccia    [explanation]

This is 1 of 31 approved meteorites classified as L5-melt breccia.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 10 Dec 2013
Writeup from MB 102:

Northwest Africa 8142 (NWA 8142)

(Northwest Africa)

Purchased: 2010

Classification: Ordinary chondrite (L5, melt breccia)

History: Three mostly crusted stones weighing 12 g were found and purchased in Agadir in 2009. Greg Catterton acquired the sample from a meteorite prospector in 2010.

Physical characteristics: Black shiny fusion crust covers 95% of the rounded ellipsoidal stones. Fusion crusted surfaces display contraction cracks.

Petrography: (A. Love, App): Sample is light greenish-gray and displays a brecciated macro-texture composed of clasts of very fine-grained (<20 μm), porphyritic-textured melt embaying areas and clasts of recrystallized chondritic rock. Melt is composed of ~19 μm zoned and unzoned, euhedral olivine grains with 205-305 μm melted and partially melted olivine phenocrysts and 0.2 - 1.3 mm rounded nodules of cellular-textured FeNi and FeS set within a silicate glass. Chondritic rock is composed of: ~400 μm angular clasts of metamorphosed chondritic material, 300 μm mineral grains and few relict chondrules (~605 μm) set within a recrystallized matrix of clastic debris.

Geochemistry: Chondritic lithology Fa23.5±0.9 (N=7), Fs19.9±0.6 (N=6), An12.2±2.0 (N=5). Unmelted phenocrysts Fa24.3±0.7 (N=5). Microporphyry Fa11.7±5.1 (N=18)

Classification: L5 Impact melt rock

Specimens: 2.4 g and 2 polished thin sections are on deposit at App

Data from:
  Table 0
  Line 0:
Place of purchase:Agadir
Date:P 2010
Mass (g):12
Class:L5-melt breccia
Shock stage:S3
Weathering grade:W1
Fayalite (mol%):23.5±0.9
Ferrosilite (mol%):19.9±0.6
Wollastonite (mol%):1.5±0.4
Classifier:A. Love, App
Type spec mass (g):2.4
Type spec location:App
Main mass:Greg Catterton
Comments:Submitted by Anthony Love
   and collections
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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     This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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