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Northwest Africa 13004
Basic information Name: Northwest Africa 13004
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13004
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 816 g
Classification
  history:
Recommended:  L4    [explanation]

This is 1 of 1646 approved meteorites (plus 4 unapproved names) classified as L4.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 25 Oct 2019
Revised 29 Nov 2019: Name changed to NWA 13004
Writeuphelp
Writeup from MB 108:

Notice: this meteorite was originally published here as "Rusalka." After review, the name has been changed to Northwest Africa13004.

Northwest Africa 13004 

Find: 2016 Mar

Classification: Ordinary chondrite (L4)

History: A fresh meteorite sample of 816 g.

Physical characteristics: The meteorite has a dark appearance with a well-preserved fusion crust.

Petrography: (A. Bischoff, IfP). The rock is an ordinary chondrite. It has a chondritic texture, with well-defined chondrules with a size of about 500 µm. The metal is well-preserved, but partly shows thin rims of typical terrestrial alteration products. The weathering degree is W1. The rock is weakly shocked with olivines having planar fractures (S3).

Geochemistry: Mineral compositions and geochemistry: (K. Klemm and A. Bischoff, IfP). The rock has equilibrated olivine (average: Fa22.6±0.7; n = 10). Low-Ca pyroxene (average: Fs17.9±2.2; (n = 9)) shows some variation in composition (range: Fs13.9-19.7) typical for type 4 ordinary chondrites. The analysis of the oxygen isotopes (A. Pack, UGött) indicates an L chondrite heritage (δ18O=5.32‰, δ17O=3.51‰; Δ17O=0.74‰). The composition has been affected by terrestrial alteration. Cosmogenic radionuclide concentrations have been analyzed (M. Laubenstein, LNGS) by means of nondestructive high purity germanium (HPGe) gamma spectroscopy in spring 2019. Of the medium and long-lived cosmogenic radionuclides only 22Na and 26Al were positively identified. From the data, it was calculated that the meteorite probably fell about 12 (±2) years ago.

Classification: Ordinary chondrite (L4, S3, W1)

Specimens: 20.5 g and polished thin section

Data from:
  MB108
  Table 0
  Line 0:
Date:2016 Mar
Mass (g):816.0
Pieces:1
Class:L4
Shock stage:S3
Weathering grade:W1
Fayalite (mol%):22.6±0.7 (n=10)
Ferrosilite (mol%):17.9±2.2 (n=9)
Wollastonite (mol%):1.0±1.0 (n=9)
Classifier:K.Klemm, Addi Bischoff
Type spec mass (g):20.5
Type spec location:IfP
Main mass:with finder, Poland
Finder:anonymous
Comments:Working name: Poznan; submitted by Kerstin Klemm; submitted by Klemm K.
Plots: O isotopes:  
Institutions
   and collections
IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)
LNGS: Laboratori Nazionali del Gran Sasso Via G. Acitelli, 22 67100 Assergi L’Aquila, Italy (institutional address; updated 21 Apr 2017)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7228 approved meteorites from (Northwest Africa) (plus 1998 unapproved names)
Synonymshelp: Rusalka (Name changed to NWA)

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