Meteoritical Bulletin: Entry for Northwest Africa 11785

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Northwest Africa 11785

Basic information

Name: Northwest Africa 11785
This is an OFFICIAL meteorite name.
Abbreviation: NWA 11785
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass: 822 g

Classification
history:

Meteoritical Bulletin:	MB 107	(2018)	Eucrite-melt breccia
Recommended:			Eucrite-melt breccia [explanation]

This is 1 of 104 approved meteorites classified as Eucrite-melt breccia. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 26 May 2018

Writeup

help

Writeup from MB 107:

Northwest Africa 11785 (NWA 11785)

(Northwest Africa)

Purchased: 22 May 2015

Classification: HED achondrite (Eucrite, melt breccia)

History: Purchased by Jay Piatek from a Moroccan meteorite dealer.

Physical characteristics: Single stone, no fusion crust. Exterior shows numerous white clasts set in a dark matrix of shock melt.

Petrography: (C. Agee, UNM) Microprobe examination shows a cataclastic mix of fragmental pyroxene and feldspar grains engulfed in abundant shock melt veins and pools. Accessory chromite and ilmenite were detected.

Geochemistry: (C. Agee, UNM) Low-Ca pyroxene Fs_53.1Wo_1.9, Fe/Mn=32, n=1; high-Ca pyroxene Fs_22.6Wo_44.1, Fe/Mn=28, n=1; plagioclase An_90.5±1.3, n=2; Shock melt (20 μm defocused electron beam, proxy for bulk meteorite composition): SiO₂=46.1±1.9, TiO₂=0.8±0.02, Al₂O₃=25.1±9.9, Cr₂O₃=0.13±0.10, MgO=5.0±3.5, FeO=9.2±6.0, MnO=0.28±0.19, CaO=14.4±2.7, Na₂O=0.66±0.27, K₂O=0.05±0.01 (all wt%), n=5.

Classification: Eucrite-melt breccia, eucrite pyroxene compositions are consistent with cumulate eucrite.

Specimens: 20 g including a probe mount on deposit at UNM, Jay Piatek holds the main mass.

Data from:
  MB107
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 22 May 2015
Mass (g):	822
Pieces:	1
Class:	Eucrite-melt breccia
Shock stage:	high
Weathering grade:	moderate
Ferrosilite (mol%):	53.1, 22.6
Wollastonite (mol%):	1.9, 44.1
Classifier:	C. Agee, UNM
Type spec mass (g):	20
Type spec location:	UNM
Main mass:	Jay Piatek
Comments:	Field name JP-75; submitted by C. Agee, UNM

Institutions
and collections

UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

Also see:

This lists the most popular meteorites among people who looked up this meteorite.

Revision
history:

This lists important revisions made to data for this record.

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