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Northwest Africa 15687
Basic information Name: Northwest Africa 15687
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15687
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 800 g
Recommended:  CR2    [explanation]

This is 1 of 186 approved meteorites classified as CR2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), and CR chondrites
Comments: Approved 4 Mar 2023
Writeup from MB 112:

Northwest Africa 15687 (NWA 15687)

(Northwest Africa)

Purchased: 2021

Classification: Carbonaceous chondrite (CR2)

History: Shun-Chung Yang and Juan Chen (S-R Meteorites) purchased three individuals weighing (607, 120, and 73 g) from an Algerian broker in April 2021.

Physical characteristics: Sample is dark brown and lacks a fusion crust. The cut face shows mm-sized metal-decorated chondrules set within a darker orangish-brown metal-bearing matrix.

Petrography: Description and classification (A. Love, App) Sample is composed of; magnesian POP and POP chondrules; rare FeO-rich olivine chondrule fragments and rare CAIs set within a metal-bearing, oxidized, opaque matrix. Chondrules have an avg. apparent diameter or 765 µm, n=72 and contain FeNi metal droplets on the interior and surrounding their rims. Chondrules and matrix contain ~6 vol% FeNi grains. Additional minerals are: abundant framboidal magnetite, troilite, pentlandite, chromite and apatite.

Geochemistry: (A. Love, App) Olivine (Fa9.0±11.6, Fe/Mn=37.5±35.7, n=20); low Ca-pyroxene (Fs4.2±2.0Wo0.9±0.9, Fe/Mn=22.8±16.7 n=22); Low analytical totals from matrix: 77.7±1.6, n=5 wt% suggest hydrous components within matrix.

Classification: Carbonaceous chondrite (CR2 C-S1 W2) Based on chondrule diameter, matrix abundance, presence of metals (implied from weathering products within and surrounding chondrules), low abundance of CAIs and presence of hydrated components within the matrix, this sample is a CR2.

Specimens: Shun-Chung Yang (S-R meteorites) holds the main masses. A polished mount and an endcut and many small fragments 22.36 g are on deposit at App.

Data from:
  Table 0
  Line 0:
Date:P 2021
Mass (g):800
Shock stage:C-S1
Weathering grade:W2
Fayalite (mol%):9.0±11.6
Ferrosilite (mol%):4.2±2.0
Wollastonite (mol%):0.9±0.9
Magnetic suscept.:4.94
Classifier:A. Love, App
Type spec mass (g):22.36
Type spec location:App
Main mass:Shun-Chung Yang (S-R meteorites)
Comments:Submitted by Anthony Love
   and collections
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
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     This is 1 of 9042 approved meteorites from (Northwest Africa) (plus 1870 unapproved names)

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