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Northwest Africa 8383 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 8383 This is an OFFICIAL meteorite name. Abbreviation: NWA 8383 Observed fall: No Year found: 2013 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 55 approved meteorites classified as Eucrite-cm. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||||
Comments: | Approved 21 May 2014 | ||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 103:
Northwest Africa 8383 (NWA 8383) (Northwest Africa) Purchased: 2013 Classification: HED achondrite (Eucrite, cumulate) History: Single stone acquired by Ruben Garcia at the 2013 Denver mineral show and donated to CMS. Physical characteristics: Single, 24.9 g, glossy fusion-crusted stone. Minor weathering. Sawn surface shows coarsely crystalline interior dominated by mm-sized light greenish-gray pyroxene crystals (roughly 85%), interstitial glassy to white plagioclase (roughly 15%), with a smattering of fine opaques. Petrography: Thin section and microprobe examination shows coarse-grained cumulate basalt composed of intercumulus irregularly-shaped plagioclase (to 5 mm in the long dimension), with cumulate pyroxene (<3 mm). Most pyroxenes show fine (<1 μm) exsolution lamellae. Silicates highly fractured and show undulatory extinction and mosaicism. Chromite with two size ranges: scattered and sparse 100 to 500 μm, and ubiquitous fine grained, typically 10 μm. Rare troilite and Fe-metal to 20 μm. Some melt veins and fractures with small-scale brecciation are present, and range in width from a few tens of microns to ~100 microns across. Geochemistry: (K. Tucker, J. Lagerman, A. Pena and L. Garvie, ASU) Low Ca-pyroxene Fs35.3±0.5Wo3.1±1.0, Fe/Mn=32.4, n=8; augite-diopside Fs14.0±0.7Wo45.0±0.4, Fe/Mn=26.6±2.0, n=5; and plagioclase An89.6±1.6Or0.4±0.1, n=5. Classification: Achondrite (cumulate eucrite). Specimens: 20.28 g and one polished thin section at ASU. | ||||||||||||||||||||||||||||||
Data from: MB103 Table 0 Line 0: |
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Institutions and collections |
ASU: Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287-1404, United States; Website (institutional address; updated 14 Jan 2012) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
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Geography: |
Statistics: This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names) |