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Northwest Africa 16504
Basic information Name: Northwest Africa 16504
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 16504
Observed fall: No
Year found: 2023
Country: (Northwest Africa)
Mass:help 23.8 kg
Classification
  history:
Recommended:  L6    [explanation]

This is 1 of 12995 approved meteorites (plus 11 unapproved names) classified as L6.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 20 Feb 2024
Writeuphelp
Writeup from MB 113:

Northwest Africa 16504 (NWA 16504)

(Northwest Africa)

Purchased: 2023 Feb

Classification: Ordinary chondrite (L6)

History: Purchased in February 2023 by Richard Rexeisen at the Tucson Gem and Mineral Show in Tucson, AZ.

Physical characteristics: Single weathered stone with fusion crust.

Petrography: (D. Sheikh, Cascadia) Sample is an equilibrated ordinary chondrite containing secondary recrystallized feldspar (~50 microns, almost all of it converted to maskelynite) and accessory Fe-Ni metal, chromite, merrillite, and troilite. A feldspathic chromite assemblage was identified in the sample.

Geochemistry: Olivine (Fa25.0±0.2, range Fa24.5-25.6, n=25), Low-Ca Pyroxene (Fs21.4±0.2Wo2.0±0.2, range Fs21.1-22.1Wo1.4-2.2, n=18).

Classification: Ordinary Chondrite (L6).

Specimens: 27.2 g type specimen at Cascadia, main mass with Richard Rexeisen.

Data from:
  MB113
  Table 0
  Line 0:
Place of purchase:Tucson, AZ
Date:P 2023 Feb
Mass (g):23800
Pieces:1
Class:L6
Shock stage:S5
Weathering grade:W3
Fayalite (mol%):25.0±0.2
Ferrosilite (mol%):21.4±0.2
Wollastonite (mol%):2.0±0.2
Classifier:D. Sheikh, Cascadia
Type spec mass (g):27.2
Type spec location:Cascadia
Main mass:Richard Rexeisen
Comments:CML 1744; RR-85; submitted by Daniel Sheikh
Institutions
   and collections
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 113, in preparation (2024)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9829 approved meteorites from (Northwest Africa) (plus 1851 unapproved names)

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