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Northwest Africa 7916
Basic information Name: Northwest Africa 7916
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7916
Observed fall: No
Year found: 2010
Country: (Northwest Africa)
Mass:help 897 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  CO3
Recommended:  CO3    [explanation]

This is 1 of 653 approved meteorites (plus 2 unapproved names) classified as CO3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites
Comments: Approved 10 Jul 2013
Writeuphelp
Writeup from MB 102:

Northwest Africa 7916 (NWA 7916)

(Northwest Africa)

Purchased: Nov 2010

Classification: Carbonaceous chondrite (CO3)

Physical characteristics: Single dark stone lacking fusion crust. Polished slices are jet black with few features visible to the naked eye.

Petrography: (L. Garvie, ASU) Abundant chondrules (~50 areal%), predominantly Type I, in a dark matrix. Chondrules to 1.5 mm, though most <200 μm. PO, POP chondrules dominate. Rare BO, RP, and C. One 1.6 × 1.1 mm AOA. CAIs common, to 1.1 mm. Matrix contains abundant micrometer-sized specks of metal and sulfide with very little alteration.

Geochemistry: (L. Garvie, ASU) Type I chondrules Fa2.5±3.4, range 0.3-35.1, n=14. Type II chondrules, some strongly zoned, Fa44.8±22.5, range Fa13.3-80.0, n=8. Low Ca pyroxene Fs2.6±1.9Wo2.9±0.7, n=4.

Specimens: 61.1 g at ASU

Data from:
  MB102
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P Nov 2010
Mass (g):897
Pieces:1
Class:CO3
Shock stage:S2
Weathering grade:W1
Fayalite (mol%):2.5±3.4; 44.8±22.5
Ferrosilite (mol%):2.6±1.9
Wollastonite (mol%):2.9±0.7
Classifier:L. Garvie, ASU
Type spec mass (g):61.1
Type spec location:ASU
Main mass:MFarmer
Finder:unknown
Comments:Submitted by L. Garvie
Institutions
   and collections		 ASU: Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287-1404, United States; Website (institutional address; updated 14 Jan 2012)
MFarmer: Michael Farmer, P.O. Box 86059, Tucson, AZ 85754-6059, United States; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Paul Griffin   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9914 approved meteorites from (Northwest Africa) (plus 1841 unapproved names)

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