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Northwest Africa 13268
Basic information Name: Northwest Africa 13268
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13268
Observed fall: No
Year found: 2013
Country: Algeria
Mass:help 333 g
Classification
  history:
Recommended:  H4/5    [explanation]

This is 1 of 501 approved meteorites classified as H4/5.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 21 Mar 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13268 (NWA 13268)

Algeria

Find: 2013

Classification: Ordinary chondrite (H4/5)

History: The meteorite has been found by nomads in Algeria in 2013. Later a Hungarian IMCA member, Zsolt Kereszty purchased this specimen from a Moroccan dealer. In the end Hungarian scientific journalist and meteorite collector Nandor Rezsabek bought it for his private meteorite collection in 21 June 2017.

Physical characteristics: A single angular dark brown stone (333.2 g) with weathered fusion crust on its two sides. Elongated regmaglypts with faint remnants of flowlines on one of the crusted sides are observable. Where the brownish black fusion crust is absent several shiny metal grains are visible and chondrules bulge out from the matrix. Cut surface reveals porous inner material. Broken surfaces show significant amount of brown alteration products.

Petrography: (D. Rezes, CSFK) The stone has chondritic texture with mostly well-defined chondrules. However, some chondrules show transition to less delineated state. Chondrules are relatively small, although some of them reach 2 mm in diameter. Igneous glass in chondrules is not observable. The texture is porous with pores up to 0.5 mm in diameter. FeNi metal and troilite show heavy oxidation without the alteration of mafic silicates. Olivine shows irregular fractures, the optical extinction is weakly undulatory. Shock veins are absent. Cl-apatite as accessory mineral is identified.

Geochemistry: (D. Rezes and M. Szabo, CSFK) Mineral chemistry: Olivine Fa16.81±0.45, Fe/Mn=23.6±3.3, N=21; Low-Ca pyroxene Fs14.90±0.61Wo1.34±0.20, Fe/Mn=13.6±1.7, N=21; Feldspar Ab80.51±1.43, N=11

Classification: Ordinary chondrite (H4/5), shock stage S2, weathering W3.

Specimens: 20 g on deposit at CSFK, N. Rezsabek holds the main mass including one polished thin section.

Data from:
  MB109
  Table 0
  Line 0:
Date:2013
Mass (g):333.2
Pieces:1
Class:H4/5
Shock stage:S2
Weathering grade:W3
Fayalite (mol%):16.81±0.45 (N=21)
Ferrosilite (mol%):14.90±0.61 (N=21)
Wollastonite (mol%):1.34±0.20 (N=21)
Classifier:D. Rezes, CSFK
Type spec mass (g):20
Type spec location:CSFK
Main mass:N. Rezsabek
Comments:Work name: RNNWAx1; submitted by D. Rezes; submitted by Daniel Rezes
Institutions
   and collections
CSFK: Research Center for Astronomy and Earth Sciences, H-1121 Budapest, Konkoly Thege Miklós út 15-17.l Hungary, Hungary (institutional address; updated 7 Apr 2015)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
Daniel Rezes         
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1005 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)

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