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| Northwest Africa 7756 | |||||||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 7756 This is an OFFICIAL meteorite name. Abbreviation: NWA 7756 Observed fall: No Year found: 2010 Country: Mali Mass:  124 g | ||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 589 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||||
| Comments: | Approved 28 Mar 2013 | ||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 102:
Northwest Africa 7756 (NWA 7756) Tombouctou, Mali Purchased: 2010 Classification: HED achondrite (Eucrite) History: The meteorite was bought in early 2010 in Tombouctou, Mali, by Michel Meda. Physical characteristics: A single oriented stone, almost entirely covered by fresh shiny fusion crust. Petrography: (J. Gattacceca, CEREGE) Unbrecciated (at the scale of polished section), medium-grained variolitic basalt with phenocrysts of low-Ca pyroxenes up to 5 mm in a matrix of smaller pyroxenes and plagioclase. Low-Ca pyroxenes form clots. Minor phases include silica, FeS, chromite. FeS is present as small inclusions (<25 μm) and large grains up to 200 μm. Rare metal as small inclusions up to 25 μm. Geochemistry: Mineral compositions: low-Ca pyroxene is zoned Fs37.3-47.9Wo20.8-8.1, mean FeO/MnO = 29.0, Plagioclase An87.1Or0.6 with mean FeO 0.45 wt.%. Chromite Cr/(Cr+Al)= 0.68. FeNi metal is Ni-poor (Ni = 0.5 wt.%). Magnetic susceptibility log χ = 2.53. Classification: Achondrite (eucrite). No apparent weathering. Specimens: 23 g and one polished section at CEREGE. N. Tourment holds the main mass. | ||||||||||||||||||||||||||||||
| Data from: MB102 Table 0 Line 0: |
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| Institutions and collections |
CEREGE: CEREGE
BP 80
Avenue Philibert, Technopole de l'Arbois
13545 Aix-en-Provence Cedex 4
France, France (institutional address; updated 10 Jun 2023) |
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| Catalogs: |
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| References: | Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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Geography:
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Statistics: This is 1 of 6 approved meteorites from Tombouctou, Mali This is 1 of 100 approved meteorites from Mali (plus 2 unapproved names) | ||||||||||||||||||||||||||||||