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Northwest Africa 14503
Basic information Name: Northwest Africa 14503
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14503
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 1000 g
Recommended:  Eucrite-melt breccia    [explanation]

This is 1 of 57 approved meteorites classified as Eucrite-melt breccia.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 5 Dec 2021
Writeup from MB 110:

Northwest Africa 14503 (NWA 14503)

(Northwest Africa)

Purchased: 2021

Classification: HED achondrite (Eucrite, melt breccia)

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

Physical characteristics: Several fragments with minor fusion crust.

Petrography: The meteorite is a melt breccia composed of large,up to 2 cm basaltic clasts and up to 1.5 mm sized mineral fragments set into abundant fine-grained and mostly recrystallized melt rock matrix. Main minerals are exsolved pyroxenes and calcic plagioclase. Mineral grains entrained in the melt matrix often show resorption textures and pyroxene also mottled compositional zoning. The recrystallized melt rock is predominantly composed of 1-2 µm sized pyroxene and feldspar grains. Minor phases include silica, chromite, ilmenite, and FeS. No metallic iron has been detected. Contains secondary calcite and barite.

Geochemistry: low-Ca pyroxene: Fs60.6±1.8Wo3.2±1.3 (Fs61.8-62.7Wo2.2-6.0, FeO/MnO=28-31, n=10); Ca-pyroxene: Fs26.9±0.6Wo43.4±0.5 (Fs26.0-28.4Wo42.2-44.0, FeO/MnO=28-36, n=10); calcic plagioclase: An89.5±3.7 (An83.5-94.7, n=10)

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2021
Mass (g):1000
Class:Eucrite-melt breccia
Shock stage:high
Weathering grade:moderate
Ferrosilite (mol%):60.6
Wollastonite (mol%):3.2
Classifier:A. Greshake, MNB
Type spec mass (g):24.5
Type spec location:MNB
Main mass:Philippe Schmitt-Kopplin
Comments:Submitted by Ansgar Greshake
   and collections
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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     This is 1 of 8136 approved meteorites from (Northwest Africa) (plus 1942 unapproved names)

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