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Northwest Africa 4522
Basic information Name: Northwest Africa 4522
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4522
Observed fall: No
Year found: 2006
Country: (Northwest Africa)
Mass:help 949 g
Meteoritical Bulletin:  MB 102  (2013)  LL3
Recommended:  LL3    [explanation]

This is 1 of 431 approved meteorites classified as LL3.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 27 Sep 2013
Writeup from MB 102:

Northwest Africa 4522 (NWA 4522)

Northwest Africa

Purchased: Oct 2006

Classification: Ordinary chondrite (LL3)

Petrography: (K.Metzler, IfP) Genomict breccia, dominated by chondrules and chondrule fragments set in a fine-grained clastic matrix. Dark chondritic lithic clasts of petrologic type 3 (various subtypes) occur with sizes up to several cm. Many of these clasts show only small amounts of matrix. One fragment-rich melt clast found.

Geochemistry: (R. Pickard, BathO; K.Metzler, IfP) Olivine and pyroxene compositions were measured in two dark chondritic lithic clasts. One clast is of petrologic type <3.5 (Fa12.9±8.1, n=21; Fs9.8±8.3, n=31) the other is of petrologic type 3.5 (Fa19.7±8.8, n=26; Fs13.1±8.8, n=27). The olivine and pyroxene statistics for the bulk sample (Fa28.4±4.7; n=44 and Fs17.0±6.7 ; n=37, respectively) indicate that the clastic matrix of this meteorite contains components of petrologic type >3.5. Oxygen isotopes (A. Pack, UGött): acid-washed bulk sample analyzed by laser fluorination gave δ18O=5.55, δ17O=3.84, Δ17O=0.92

Specimens: 71.2 g IfP; 20 g BathO.

Data from:
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P Oct 2006
Mass (g):949
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):28.4±4.7 (7-33; n=44)
Ferrosilite (mol%):17.0±6.7 (3-26; n=37)
Classifier:R. Pickard, BathO, and K. Metzler, IfP
Type spec mass (g):71.2
Type spec location:IfP
Main mass:C. Giessler, Germany
Comments:Submitted by Ray Pickard, Knut Metzler
Plots: O isotopes:  
   and collections
IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)
BathO: Bathurst Observatory Research Facility, 624 Limekilns Road, Kelso NSW 2795, Australia (institutional address; updated 27 Jul 2012)
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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Photos from the Encyclopedia of Meteorites:
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     This is 1 of 8745 approved meteorites from (Northwest Africa) (plus 1880 unapproved names)

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