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22.70g Eucrite Slice Monomict Basaltic Breccia

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  • $ 455.00

On Offer: 22.70 gram Eucrite Slice (Monomict Basaltic Breccia)  I NWA 12929
Dimensions: 51 mm x 51 mm x 4 mm
Type: Eucrite, Monomict Basaltic Breccia, equilibrated.
Origin: Northwest Africa
Official name: NWA 12929
Description: 22.70 gram polished on one side, slice of equilibrated eucrite monomict basaltic breccia, NWA 12929.
What you get: 22.70 gram NWA 12929 Eucrite meteorite specimen as shown & signed Certificate of Authenticity.
I offer a 100% no questions asked 30 day return policy.

Northwest Africa 12929
Basic information Name: Northwest Africa 12929
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12929
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 23.7 kg
Meteoritical Bulletin:   MB 108   (2020)   Eucrite-mmict
Recommended:   Eucrite-mmict    

This is 1 of 272 approved meteorites classified as Eucrite-mmict.   

Comments: Approved 21 Nov 2019
Writeup froMB 108:

Northwest Africa 12929 (NWA 12929)

(Northwest Africa)

Purchased: 2016

Classification: HED achondrite (Eucrite, monomict)

History: Purchased Dec. 2018 by Dustin Dickens in Morocco from anonymous dealer.

Physical characteristics: Many identically appearing pieces, desert weathered exterior, broken surface reveals a dark, fine grained interior.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows mild brecciation with approximately 60% pyroxene and 35% plagioclase. Many pyroxenes have exsolution lamellae. Minor silica and troilite observed. Shock melt veins are present.

Geochemistry: (C. Agee, UNM) Low-Ca pyroxene Fs61.6±1.8Wo3.3±2.4, Fe/Mn=32±0, n=9; high-Ca pyroxene Fs36.7±9.5Wo33.4±10.9, Fe/Mn=31±0, n=4; plagioclase An89.4±3.1, n=7.

Classification: Monomict basaltic eucrite, equilibrated.

Data from:
  Table 0
  Line 0:
Place of purchase: Mauritania
Date: P 2016
Mass (g): 23700
Pieces: Many
Class: Eucrite-mmict
Shock stage: high
Weathering grade: moderate
Ferrosilite (mol%): 61.6±1.8, 36.7±9.5
Wollastonite (mol%): 3.3±2.4, 33.4±10.9
Classifier: C. Agee, UNM
Type spec mass (g): 23.8
Type spec location: UNM
Main mass: Dustin Dickens
Comments: Field name DD-54; submitted by C. Agee, UNM
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States;  (institutional address; updated 12 Feb 2015)

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