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Northwest Africa 7756
Basic information Name: Northwest Africa 7756
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7756
Observed fall: No
Year found: 2010
Country: Mali
Mass:help 124 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  Eucrite
Recommended:  Eucrite    [explanation]

This is 1 of 508 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 28 Mar 2013
Writeuphelp
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:
State/Prov/County:Tombouctou
Place of purchase:Tombouctou
Date:P 2010
Mass (g):124
Pieces:1
Class:Eucrite
Weathering grade:low
Ferrosilite (mol%):37.3-47.9
Wollastonite (mol%):8.1-20.8
Magnetic suscept.:2.53
Classifier:J. Gattacceca, CEREGE
Type spec mass (g):25
Type spec location:CEREGE
Main mass:N. Tourment
Comments:Submitted by J. Gattacceca
Institutions
   and collections
CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 29 Oct 2018)
Catalogs:
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Mali
Coordinates:Unknown.

Statistics:
     This is 1 of 4 approved meteorites from Tombouctou, Mali
     This is 1 of 51 approved meteorites from Mali (plus 1 unapproved name)

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