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Northwest Africa 8713 | |||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 8713 This is an OFFICIAL meteorite name. Abbreviation: NWA 8713 Observed fall: No Year found: 2014 Country: Morocco Mass: 1007 g | ||||||||||||||||||||||||
Classification history: |
This is 1 of 408 approved meteorites classified as Eucrite-pmict. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||
Comments: | Approved 11 Apr 2015 | ||||||||||||||||||||||||
Writeup |
Writeup from MB 104:
Northwest Africa 8713 (NWA 8713) Morocco Purchased: Nov 2014 Classification: HED achondrite (Eucrite, polymict) Petrography: This sample is brecciated with mineral and lithic fragments set in a fine-grained fragmental matrix. The major minerals are angular pyroxene (70 vol.%, mostly orthopyroxene (Fs38.9±17.4Wo2.4±0.7) and minor pigeonite (Fs50.6±3.1Wo7.7±1.8) with a variation of Fe content and plagioclase (20 vol.%, An88.2-95.1; n=11) ranging from 20-850 μm. A few cumulate eucrite clasts have coarse-grained pyroxene and calcic plagioclase. The presence of large pyroxene grains with relatively uniform composition of Fs23-28Wo1.4-2.3 suggests the presence of a diogenitic composition, but it only accounts for approximately 7 vol.%. A number of hypersthene grains have augite exsolution lamella 1 to 30 μm wide. Melted clasts are present with recrystallized augite, orthopyroxene and interstitial plagioclase. Silica is commonly present. Minor phases include ilmenite, troilite, chromite, and FeNi metal. Geochemistry: Orthopyroxene (Fs14.9-65.5Wo1.2-3.5), pigeonite (Fs29.1-48.4Wo5.5-8.9), Fe/Mn=25.2-31.8; augite lamella (Fs26.6-31.4Wo40.7-42.4); anorthite (An88.2-95.1). | ||||||||||||||||||||||||
Data from: MB104 Table 0 Line 0: |
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Institutions and collections |
PMO: Purple Mountain Observatory, Nanjing, China (institutional address; updated 16 Dec 2011) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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Geography: |
Statistics: This is 1 of 2082 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||
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Revision history: |
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