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Northwest Africa 15718
Basic information Name: Northwest Africa 15718
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15718
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 813 g
Classification
  history:
Meteoritical Bulletin:  MB 112  (2023)  Mesosiderite
Recommended:  Mesosiderite    [explanation]

This is 1 of 276 approved meteorites classified as Mesosiderite.   [show all]
Search for other: Mesosiderites, Metal-rich meteorites
Comments: Approved 19 Mar 2023
Writeuphelp
Writeup from MB 112:

Northwest Africa 15718 (NWA 15718)

(Northwest Africa)

Purchased: 2022

Classification: Mesosiderite

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

Physical characteristics: Dark brownish rock lacking fusion crust.

Petrography: The meteorite displays a dark brownish interior and is composed of silicate (about 50 vol%) and metallic (about 50 vol%) portions. The silicate fraction shows a recrystallized texture dominantly composed of up to 1 mm sized low-Ca pyroxene and calcic plagioclase. Pyroxenes often contain feldspar, sulfide and blebby metal inclusions. Some larger feldspar grains contain arrays of typically elliptical silica and augite inclusions. Minor phases include chromite, FeS, and merrillite. The metallic lithology consists of only weakly altered kamacite and taenite.

Geochemistry: low-Ca pyroxene: Fs30.0±0.4Wo3.1±0.3 (Fs29.3-30.6Wo2.6-3.4, FeO/MnO=21-24, n=10); Ca-pyroxene: Fs12.2±0.5Wo43.6±0.3 (Fs11.6-13.0Wo43.2-44.2, FeO/MnO=14-17, n=10); calcic plagioclase: An93.5±2.4 (An89.6-96.1, n=10)

Data from:
  MB112
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2022
Mass (g):813
Pieces:1
Class:Mesosiderite
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):30.0; 12.2
Wollastonite (mol%):3.1; 43.6
Classifier:A. Greshake, MNB
Type spec mass (g):25.2
Type spec location:MNB
Main mass:Polandmet - Marcin Cimala
Comments:Submitted by Ansgar Greshake
Institutions
   and collections
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
Polandmet: targoniny 30 43445 Dziegielow Poland, Poland; Website (institutional address; updated 7 May 2021)
Catalogs:
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9746 approved meteorites from (Northwest Africa) (plus 1855 unapproved names)

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