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Northwest Africa 13370
Basic information Name: Northwest Africa 13370
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13370
Observed fall: No
Year found: 2020
Country: Morocco
Mass:help 312 g
Classification
  history:
Recommended:  Howardite    [explanation]

This is 1 of 382 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 2 Aug 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13370 (NWA 13370)

Morocco

Purchased: 2020

Classification: HED achondrite (Howardite)

History: In February of 2020, Fabien Kuntz purchased two stones with a total weight of 311.8 g from a meteorite prospector in Guelmim, Morocco.

Physical characteristics: A sample from each stone was submitted for classification. Both stones have a dark-brown, wind-ablated exterior. Clasts are visible on the exterior. The cut face shows sample is a breccia with visible orthopyroxene clasts, lithic clasts up to 2 mm and flecks of Fe metal.

Petrography: Description and Classification (A. Love, App) Sample is composed of (vol %): angular to rounded lithic clasts of eucrite (70) and diogenite (30) and similar mineral fragments set within a comminuted matrix of these materials. Lithic clasts are: cumulate and equilibrated basaltic eucrite; diogenite (including a poikilitic diogenite) and a highly magnesian olivine-orthopyroxene lithology (Fa5-Fs13Wo0.3); and several shock-melted clasts (melt breccia - total melt). Eucritic pyroxenes are exsolved. Additional minerals are olivine chromite, ilmenite, troilite, plagioclase, Fe metal grains and a silica polymorph.

Geochemistry: (A. Love, App) Diogenite: orthopyroxene (Fs26.0±5.1Wo1.7±1.1, Fe/Mn=32.2±4.1, n=12); Olivine, Fa25.2±14.8 (Fa5.6-47.7, Fe/Mn=40.6±6.8, n=9). Eucrite: low-Ca pyroxene (Fs52.7±10.0Wo3.2±1.2, Fe/Mn=29.4±1.4, n=5); pigeonite (Fs42.7-49.7Wo8.9-12.1, N=2); high-Ca pyroxene (27.5±7.0Wo40.8±2.2, n=5); plagioclase (An93.1±2.4Or0.2±0.1, n=6).

Classification: HED achondrite (howardite). Based on texture, modal abundances, unequilibrated mineral compositions, Fe/Mn and Mg# of orthopyroxenes and olivines, this sample is a howardite with a shock stage corresponding to M-S2 and low weathering grade.

Specimens: Kuntz holds the main masses. Two slices weighing 29.78 g and a polished thin section are on Deposit at App.

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Guelmim
Date:P 2020
Mass (g):311.8
Pieces:2
Class:Howardite
Shock stage:M-S2
Weathering grade:low
Fayalite (mol%):25.2±14.8
Ferrosilite (mol%):26.0±5.1; 52.7±10.0; 27.5±7.0
Wollastonite (mol%):1.7±1.1; 3.2±1.2; 40.8±2.2
Magnetic suscept.:3.63
Classifier:A. Love, App
Type spec mass (g):29.78
Type spec location:App
Main mass:Fabien Kuntz
Comments:Submitted by Anthony Love
Institutions
   and collections
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
Kuntz: Fabien Kuntz, France; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1498 approved meteorites from Morocco (plus 22 unapproved names) (plus 1 impact crater)

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