Meteoritical Bulletin: Entry for Northwest Africa 12700

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Northwest Africa 12700

Basic information

Name: Northwest Africa 12700
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12700
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass: 38.9 g

Classification
history:

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

This is 1 of 293 approved meteorites classified as Eucrite-mmict. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 18 Aug 2019

Writeup

Writeup from MB 108:

Northwest Africa 12700 (NWA 12700)

(Northwest Africa)

Purchased: 2019

Classification: HED achondrite (Eucrite, monomict)

History: The meteorite was purchased from a local meteorite dealer in Guelmin, Morocco.

Physical characteristics: Flat shaped single stone partly covered by fusion crust.

Petrography: The meteorite is a breccia with fine- and coarse-grained basaltic and black melt clasts set into a clastic mineral matrix. Dominant minerals are exsolved pyroxene and calcic plagioclase of highly variable grain sizes between 80 μm and 1 mm. Minor phases include silica, chromite, FeS, and ilmenite. No metallic Fe has been found.

Geochemistry: low-Ca pyroxene: Fs_59.8±0.5Wo_2.2±0.2(Fs_58.9-60.6Wo_1.8-2.8, n=11, FeO/MnO=29-31); Ca-pyroxene: Fs_25.4±0.9Wo_43.5±1.0(Fs_24.1-27.0Wo_41.8-45.0, n=15, FeO/MnO=26-35); calcic plagioclase: An_91.7±0.6(An_90.7-92.8, n=16)

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Zagora, Morocco
Date:	P 2019
Mass (g):	38.9
Pieces:	1
Class:	Eucrite-mmict
Shock stage:	low
Weathering grade:	low
Ferrosilite (mol%):	59.8; 25.4
Wollastonite (mol%):	2.2; 43.5
Classifier:	A. Greshake, MNB
Type spec mass (g):	7.9
Type spec location:	MNB
Main mass:	Fabien Kuntz
Comments:	Submitted by Ansgar Greshake

Institutions
and collections

MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
Kuntz: Fabien Kuntz, France; Website (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:

Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Ricardo Neto
Ryan Upchurch

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9914 approved meteorites from (Northwest Africa) (plus 1841 unapproved names)

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