Meteoritical Bulletin: Entry for Northwest Africa 12865

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 12865

Basic information

Name: Northwest Africa 12865
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12865
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass: 10.9 g

Classification
history:

Meteoritical Bulletin:	MB 108	(2020)	Eucrite
Recommended:			Eucrite [explanation]

This is 1 of 598 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 11 Oct 2019

Writeup

help

Writeup from MB 108:

Northwest Africa 12865 (NWA 12865)

(Northwest Africa)

Purchased: 2011

Classification: HED achondrite (Eucrite)

History: Catalogued in the ROM collection as LM57451

Physical characteristics: Visible fusion crust with low weathering, evident with minor light orange caliche in fractures. Interior of the sample is fresh, showing a coarse-grained cumulate texture. Only slight weathering on the inside of the sample.

Petrography: (K. Tait, I. Nicklin, ROM) Breccia composed of basaltic and gabbroic clasts and mineral grain fragments set in a finely comminuted matrix. The largest clast is 5 × 3 mm. One thin shock vein (0.5 mm maximum width) runs discontinuously across the thin section. Mineral grains in the clasts and matrix show undulose extinction.

Geochemistry: Mineral composition and geochemistry: Plagioclase An_87.9±1.4(n = 28). Low-Ca pyroxene composition: Fs_34.7±2.3Wo_5.1±4.9and Mg#32.6-41.8 (n=14). High-Ca pyroxene composition: Fs_30.0±0.8Wo_42.5±1.2, Mg#49.6-53.9 (n=10).

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Tucson
Date:	P 2011
Mass (g):	10.91
Pieces:	2
Class:	Eucrite
Shock stage:	moderate
Weathering grade:	low
Ferrosilite (mol%):	30.0±0.8, 34.7±3.7
Wollastonite (mol%):	5.1±4.9, 42.5±1.2
Classifier:	K. Tait, ROM
Type spec mass (g):	2.2
Type spec location:	ROM
Main mass:	DGregory
Comments:	Submitted by V. Di Cecco, ROM

Institutions
and collections

ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011)
DGregory: David Gregory, 230 First Avenue, Suite 108, St. Thomas, Ontario N5R 4P5, Canada (private address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150

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