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Northwest Africa 12533
Basic information Name: Northwest Africa 12533
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12533
Observed fall: No
Year found: 2018
Country: Morocco
Mass:help 220 g
Meteoritical Bulletin:  MB 108  (2020)  H4/5
Recommended:  H4/5    [explanation]

This is 1 of 502 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 10 Mar 2019
Writeup from MB 108:

Northwest Africa 12533 (NWA 12533)


Purchased: 2018 Apr

Classification: Ordinary chondrite (H4/5)

History: A 220 g fragment of the meteorite was purchased by Curtis Bing from a dealer in the US (April, 2018). The dealer brought the sample in Marrakech, Morocco. The stone was a broken fragment surrounded by fusion crust. A polished thin section was carefully prepared from the fragment and subsequently examined using optical microscopy to identify the texture and mineralogy and electron microprobe for the mineral chemistry.

Physical characteristics: One piece. The color of the meteorite is pale brown.

Petrography (I. Baziotis, AUA): Textural observations of the thin section in both transmitted and reflected light showed that it is chondritic. It contains porphyritic and nonporphyritic chondrules, both Type I (Mg/(Mg+Fe)<90). The porphyritic olivine (PO) chondrules have rounded to oval shape ranging from 300 to 500 µm. The PMD for olivine is <5% (0.25). The PMD for low-Ca pyroxene is <1%. Both monoclinic and orthorhombic pyroxene are present. The groundmass consists of olivine, low Ca-pyroxene (orthopyroxene and pigeonite), high-Ca pyroxene, plagioclase and rare phosphates (merrillite). The olivine and plagioclase show sharp extinction, indicating shock stage S1. Shock veins were not observed. The rock matrix is cross-cut by numerous interconnected opaque veins. Black fusion crust covers the sample. Red-brown oxidation is visible on the exterior surface, around metal grains on cut surfaces and within the matrix.

Geochemistry: Feldspathic chondrule mesostasis Ab87.6-82.8. High-Ca Pyroxene Fs6.1±0.7Wo45.1±1.1 (n=18).

Classification (I. Baziotis, S. Xydous, AUA): Ordinary chondrite (H4/5, W2, S1).

Specimens: 20 g at NHMV

Data from:
  Table 0
  Line 0:
Place of purchase:Morroco
Date:P 2018 Apr
Mass (g):220
Shock stage:S1
Weathering grade:W2.0
Fayalite (mol%):19.3±0.8 (N=20)
Ferrosilite (mol%):17.1±0.5 (n=18)
Wollastonite (mol%):0.79±0.45
Classifier:I. Baziotis, S. Xydous, AUA
Type spec mass (g):20
Type spec location:NHMV
Main mass:Curtis Bing
Comments:Submitted by I. Baziotis
   and collections
NHMV: Naturhistorisches Museum, Burgring 7, 1010 Wien, Austria, Austria; Website (institutional address; updated 18 Jan 2019)
AUA: Department of Natural Resources Management and Agricultural Engineering Agricultural Univ. of Athens Iera Odos 75, 11855 Athens, Greece (institutional address; updated 10 Mar 2018)
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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Public domain photographs:
I. Baziotis         


     This is 1 of 1647 approved meteorites from Morocco (plus 22 unapproved names) (plus 1 impact crater)

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