Meteoritical Bulletin: Entry for Northwest Africa 8730

header

MetSoc Home Publications Contacts

Search the Meteoritical Bulletin Database
Last update: 15 Apr 2024
Search for:	Search type:	Search limits:	Display:	Publication:
Names Text Places Classes Years	Contains Starts with Exact Sounds like	NonAntarctic Falls Non-NWAs Has strewnfield		What's new in the last:
Include past classifications in search		Has photo	Limit to approved meteorite names
Search text:

Northwest Africa 8730

Basic information

Name: Northwest Africa 8730
This is an OFFICIAL meteorite name.
Abbreviation: NWA 8730
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass: 51.8 g

Classification
history:

Meteoritical Bulletin:	MB 104	(2015)	Eucrite-cm
Recommended:			Eucrite-cm [explanation]

This is 1 of 54 approved meteorites classified as Eucrite-cm. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 4 Feb 2015

Writeup

help

Writeup from MB 104:

Northwest Africa 8730 (NWA 8730)

(Northwest Africa)

Found: 2014

Classification: HED achondrite (Eucrite, cumulate)

History: Recovered in April 2014 near the borders of Mauritania, Western Sahara and Algeria. Purchased in Mauritania in June 2014.

Physical characteristics: A single stone with fusion crusted exterior. A saw cut reveals cumulate texture of mm-size white feldspar and green pyroxene grains.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows approximately equal amounts of pyroxene and plagioclase, unbrecciated, numerous shock fractures. Glassy fusion crust up to 30 μm thick. Accessory chromite.

Geochemistry: (C. Agee and N. Muttik, UNM). Low-Ca pyroxene Fs_49.7±1.8Wo_2.7±2.2, Fe/Mn=29±0, n=10; augite Fs_19.9±0.7Wo_44.0±1.4, Fe/Mn=25±1, n=11; plagioclase An_93.4±0.4Ab_6.2±0.4Or_0.4±0.1, n=5; fusion crust (proxy for bulk composition) SiO₂=46.9±1.1, TiO₂=0.01±0.01, Al₂O₃=15.4±3.0, Cr₂O₃=0.25±0.06, MgO=9.5±1.5, FeO=15.5±2.5, MnO=0.57±0.08, NiO=0.02±0.04, CaO=10.4±0.9, Na₂O=0.25±0.04, K₂O=0.04±0.01 (all wt%), Mg#=52.1±1.1.

Classification: Achondrite (cumulate eucrite). Equilibrated, clear separation of high-Ca and low-Ca pyroxene. Low weathering grade, high shock stage.

Specimens: 10.5 g including a probe mount on deposit at UNM, DPitt holds the main mass.

Data from:
  MB104
  Table 0
  Line 0:

Place of purchase:	Mauritania
Date:	2014
Mass (g):	51.8
Pieces:	1
Class:	Eucrite-cm
Shock stage:	high
Weathering grade:	low
Ferrosilite (mol%):	49.7±1.8
Wollastonite (mol%):	2.7±2.2
Classifier:	C. Agee, UNM
Type spec mass (g):	10.5
Type spec location:	UNM
Main mass:	Darryl Pitt
Comments:	Field name MAC 83; 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)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full

Find references in NASA ADS:
Find references in Google Scholar:

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.

Direct link to this page