Meteoritical Bulletin: Entry for Northwest Africa 12493

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Northwest Africa 12493

Basic information

Name: Northwest Africa 12493
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12493
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass: 702 g

Classification
history:

Recommended:

H3-5 [explanation]

This is 1 of 83 approved meteorites classified as H3-5. [show all]
Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Comments:

Approved 18 Apr 2020

Writeup

help

Writeup from MB 109:

Northwest Africa 12493 (NWA 12493)

(Northwest Africa)

Purchased: 2018

Classification: Ordinary chondrite (H3-5)

History: Purchased at Hamburg Mineral Show Dec. 2018.

Physical characteristics: 701.5 g black-brown stone fragment, partly covered by black fusion crust with one 1 cm metal inclusion. Cut face shows gray host with lighter and darker gray xenoliths.

Petrography: (R. Bartoschewitz, Bart) dark lithology: well defined chondrules (0.1-1.5 mm, av. ~0.4 mm) of various types and irregular metallic inclusions up to 10 mm (some with eutectic metal/troilite intergrowth) in a black opaque matrix. Light lithology: strongly recrystallized matrix with indistinct chondrules and metal.

Geochemistry: Dark H3: olivine Fa_18.6±3.3(range 13.1-30.7; n=34); low Ca pyroxene Fs_16.3±2.5Wo_1.1±0.6(n=33); Ca pyroxene En₆₉Fs₁₇Wo₁₄(n=2); chromite CRAL=91, FFM=87 (n=2); kamacite Ni=6.7-7.9 wt%, Co=0.6 wt% (n=5). Light H5: olivine Fa_18.5±0.8(n=10), low Ca pyroxene Fs_16.4±0.3Wo_1.5±0.4(n=4); Ca pyroxene En₇₉Fs₁₆Wo₅(n=1); chromite CRAL=83, FFM=85 (n=2); kamacite Ni=3.6-5.7 wt%, Co=0.6-0.7 wt% (n=3). Magnetic susceptibility log χ (× 10^-9 m³/kg) = 5.55, ρ=3.69 g/cm3

Classification: Ordinary chondrite (H3-5, S2, W0)

Specimens: 26.1 g on deposit at Kiel, Bart holds the main mass.

Data from:
  MB109
  Table 0
  Line 0:

Place of purchase:	Hamburg
Date:	P 2018
Mass (g):	701.5
Pieces:	1
Class:	H3-5
Shock stage:	S2
Weathering grade:	W1
Fayalite (mol%):	18.9±2.4 (13.1-30.7; n=44)
Ferrosilite (mol%):	16.3±1.7 (n=37)
Wollastonite (mol%):	1.2±0.6
Magnetic suscept.:	5.55
Classifier:	R. Bartoschewitz
Type spec mass (g):	26.1
Type spec location:	Kiel
Main mass:	Bart
Finder:	anonymous
Comments:	NWA-RB02; submitted by R. Bartoschewitz

Institutions
and collections

Kiel: Geologisches und Mineralogisches Museum, Institut für Geowissenschaften, Christian-Albrechts-Universität Kiel, Ludewig-Mayn-Str. 10, D-24118 Kiel, Germany, Germany (institutional address; updated 13 Sep 2013)
Bart: Bartoschewitz Meteorite Laboratory, Weiland 37, D-38518 Gifhorn, Germany; Website (private address; updated 30 Nov 2019)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 109, in preparation (2020)

Find references in NASA ADS:
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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9111 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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