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Northwest Africa 1982
Basic information Name: Northwest Africa 1982
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 1982
Observed fall: No
Year found: 2000
Country: (Northwest Africa)
Mass:help 368 g
Classification
  history:
Meteoritical Bulletin:  MB 88  (2004)  Achondrite-ung
MetBase:  v. 7.1  (2006)  Mesosiderite-C
Recommended:  Mesosiderite-C    [explanation]

This is 1 of 8 approved meteorites classified as Mesosiderite-C.   [show all]
Search for other: Class C mesosiderites, Mesosiderites, and Metal-rich meteorites
Writeuphelp
Writeup from MB 88:

Northwest Africa  1982

Morocco

Found 2000

Achondrite (ungrouped)

A 368 g partially crusted stone was purchased in Rissani in 2001. Classification and mineralogy (T. Bunch and J. Wittke, NAU): cataclastic pyroxenite with randomly dispersed metal grains; partial recrystallization of matrix and along fractures of large (up to 5 mm) orthopyroxene grains. Mineral modes: orthopyroxene, 68 vol.%; metal, 12%; plagioclase. 8%; troilite, 3%; ilmenite, 3%; phosphate, 2% spinels, 2%, and augite, 2%.  Opx = Fs28Wo3; kamacite, Ni = 4.8 to 5.4 wt %; taenite, Ni = 31.4 to 36.7%; plagioclase = An90; spinel #1, Al2O3 = 61 wt%, MgO = 21.4%, FeO = 13.2%; spinel #2, Cr2O3 = 35.9%, Al2O3 = 33.0%, MgO = 17.9%,  FeO = 13.1%; augite = Fs13Wo43. Oxygen isotope composition is somewhat outside the range of HED and closest to brachinites and IAB-IIICD irons (R. N. Clayton, UChi) : δ18O = +3.78‰, δ17O = +1.47‰, δ 17O = -0.50 ‰. Cosmic ray exposure age (O. Eugster, UBE): of 18.6+-2.0 Ma falls on the major CRE cluster of the HED meteorites. Not paired with NWA 1827 or 1879 mesosiderite C.  Shock level, S1. Weathering grade. W1. Specimens: Type specimens 13.8 g, NAU, 11.5 g with O. Eugster, UBE; main mass. Fectay.

Data from:
  MB88
  Table 4
  Line 111:
Place of purchase:Rissani
Date:2000
Mass (g):368
Pieces:1
Class:Achon
Type spec mass (g):25.3
Plots: O isotopes:  
Institutions
   and collections
NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
Fectay: Bruno Fectay and Carine Bidaut, La Memoire de la Terre SARL, 39800 Aumont, France; Website (private address)
UBE: University of Bern, University of Bern, Hochschulstrasse 4, CH-3012 Bern, Switzerland (institutional address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 88, MAPS 39, A215-A272 (2004)
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
Bruno Fectay and Carine Bidaut   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6758 approved meteorites from (Northwest Africa) (plus 2048 unapproved names)

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