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Northwest Africa 13173
Basic information Name: Northwest Africa 13173
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13173
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 47.4 g
Classification
  history:
Meteoritical Bulletin:  MB 109  (2020)  H5
Recommended:  H5    [explanation]

This is 1 of 11567 approved meteorites (plus 23 unapproved names) classified as H5.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 5 Feb 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13173 (NWA 13173)

(Northwest Africa)

Find: 2017

Classification: Ordinary chondrite (H5)

History: The 47.44 g fragment was found by a border security agent on near the border between Morocco and Western Sahara in 2017. Dave Lehman and a partner acquired the stone from the finder.

Physical characteristics: Sample is irregular-ovoid in shape and has a dark brown, wind-ablated exterior. The interior of the stone shows chondrules and fragments set within a recrystallized matrix.

Petrography: Classification and Description (A. Love, App): Sample shows recrystallized chondritic texture composed of closely packed chondrules with an avg. apparent diameter 377 μm (n=9). Secondary plagioclase has an average size of 39 μm (n=9). Additional minerals are: albitic plagioclase, troilite, apatite, taenite and kamacite, chromite.

Geochemistry: (A. Love, App): Olivine (Fa19.1±0.4, Fe/Mn=35.5±0.8, n=3), low-Ca pyroxene (Fs16.7±0.4Wo2.5±1.9, n=3)

Classification: Ordinary chondrite (H5, C-S3, W2) Based on mineral compositions, chondrule diameters and size of secondary plagioclase, this sample is H5.

Specimens: Dave Lehman and his partner hold the main mass. A polished thin section and endcut weighing 4.1g are on deposit at App.

Data from:
  MB109
  Table 0
  Line 0:
Date:2017
Mass (g):47.44
Pieces:1
Class:H5
Shock stage:C-S3
Weathering grade:W1
Fayalite (mol%):19.1±0.4
Ferrosilite (mol%):16.7±0.4
Wollastonite (mol%):2.5±1.9
Magnetic suscept.:4.83
Classifier:A. Love, App
Type spec mass (g):9.5
Type spec location:App
Main mass:Dave Lehman
Finder:Unknown
Comments:Submitted by Anthony Love
Institutions
   and collections		 App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
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 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)
Also see:
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Revision
  history:
  This lists important revisions made to data for this record.

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