Northwest Africa 14682

Name: Northwest Africa 14682
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14682
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass: 14 kg

Recommended:  Eucrite-unbr    

This is 1 of 117 approved meteorites classified as Eucrite-unbr. 

Approved 16 May 2022

Writeup from MB 111:

Northwest Africa 14682 (NWA 14682)

(Northwest Africa)

Purchased: 2020

Classification: HED achondrite (Eucrite, unbrecciated)

History: Purchased January 2020, by Mark Lyon from a Northwest African dealer

Physical characteristics: Single stone with black fusion crust. Interior shows unbrecciated texture with millimeter-sized dark green pyroxenes and white plagioclase crystals. Cut and broken surfaces shows equigranular, medium grained, basaltic texture.

Petrography: (A. Ross, UNM; D. Dickens, NMMS; C. Agee, UNM) Microprobe examination of a polished mount shows approximately equal amounts of pyroxene and plagioclase grains often in poikiloblastic arrangement. Some pyroxenes have exsolution. Ubiquitous silica, ilmenite, and troilite. No metal was observed.

Geochemistry: (A. Ross, UNM) Low-Ca pyroxene Fs61.7±0.2Wo1.8±0.2, Fe/Mn=33±1, n=7; high-Ca pyroxene Fs29.5±5.0Wo40.0±5.8, Fe/Mn=32±2, n=5; plagioclase An84.7±4.3, n=7;

Classification: Achondrite (equilibrated unbrecciated eucrite). Equilibration and clear compositional separation of low-calcium and high-calcium pyroxenes is consistent with type 6 eucrites.

Specimens: 28.6 g including a probe mount on deposit at UNM, Mark Lyon holds the main mass.

Data from:
  MB111
  Table 0
  
Place of purchase:Algeria
Date:P 2020
Mass (g):14 kg
Pieces:1
Class:Eucrite-unbr
Shock stage:low
Weathering grade:low

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