header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 18 Sep 2021
Search for: Search type: Search limits: Display: Publication:
Names
Text help
Places
Classes
Years
Contains
Starts with
Exact
Sounds like
NonAntarctic
Falls  Non-NWAs
What's new
  in the last:
Limit to approved meteorite names
Search text:  
Northwest Africa 13996
Basic information Name: Northwest Africa 13996
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13996
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 163 g
Classification
  history:
Recommended:  EL-melt rock    [explanation]

This is 1 of 20 approved meteorites classified as EL-melt rock.   [show all]
Search for other: EL chondrites, Enstatite chondrites, Enstatite chondrites (type 4-7), Enstatite-rich meteorites, and Melted chondrites
Comments: Approved 17 Jul 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13996 (NWA 13996)

(Northwest Africa)

Purchased: 2018

Classification: Enstatite chondrite (EL melt rock)

History: Purchased in 2018 by Geologist Juan Aviles Poblador from a meteorite dealer in Morocco.

Physical characteristics: Single weathered stone with minor fusion crust. Impact melt pockets and vesicles are present in varying abundance between different fragments and slices of the sample.

Petrography: (D. Sheikh, Cascadia) This sample exhibits an equigranular texture consisting primarily of recrystallized grains of enstatite (~94 vol.% ,Av. 75±10 µm, n=20), and accessory albitic plagioclase, oldhamite, daubreelite, troilite, silica glass, and sparse grains of kamacite (< 1 vol. %, containing ~1.5 wt.% Si, n=3). A few relict chondrules were observed, most displaying a radial pyroxene texture (Av. 1 mm, up to 3 mm, n=4).

Geochemistry: Enstatite (Fs0.1±0.1Wo1.4±0.1, range Fs0.0-0.6Wo1.1-1.6, n=70), Plagioclase (An16.2±0.6 Or3.8±0.4, range An15.5-16.9 Or3.1-4.2, n=8).

Classification: Enstatite-melt rock (EL-melt rock). EL due to the amount of Si in kamacite, melt rock due to the overall texture.

Specimens: 21.1 g and a thin section at Cascadia; main mass with Juan Aviles Poblador.

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2018
Mass (g):163
Pieces:1
Class:EL-melt rock
Shock stage:low
Weathering grade:moderate
Ferrosilite (mol%):0.1±0.1
Wollastonite (mol%):1.4±0.1
Classifier:D. Sheikh, Cascadia
Type spec mass (g):21.1
Type spec location:Cascadia
Main mass:Juan Aviles Poblador
Comments:Submitted by Daniel Sheikh
Institutions
   and collections
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7885 approved meteorites from (Northwest Africa) (plus 1958 unapproved names)

Direct link to this page