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Northwest Africa 15804
Basic information Name: Northwest Africa 15804
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15804
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 1024 g
Classification
  history:
Recommended:  H4    [explanation]

This is 1 of 6415 approved meteorites (plus 2 unapproved names) classified as H4.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 19 Mar 2023
Writeuphelp
Writeup from MB 112:

Northwest Africa 15804 (NWA 15804)

(Northwest Africa)

Purchased: April 2017

Classification: Ordinary chondrite (H4)

History: Acquired online in April 2017 by James Shelton from a meteorite dealer in northwest Africa.

Physical characteristics: Multiple stones with dark-brown fusion crust.

Petrography: (D. Sheikh, Cascadia) Sample is comprised of chondrules set within a fine-grained matrix containing accessory Fe-Ni metal, troilite, and chromite.

Geochemistry: Olivine (Fa17.7±1.0, range Fa16.5-20.0, n=19), Low-Ca Pyroxene (Fs16.0±1.5Wo1.1±0.9, range Fs14.5-19.5Wo0.3-4.4, n=19).

Classification: Ordinary chondrite (H4).

Specimens: 20.2 g at Cascadia, main mass with James Shelton.

Data from:
  MB112
  Table 0
  Line 0:
Place of purchase:online
Date:P April 2017
Mass (g):1024
Pieces:6
Class:H4
Shock stage:S4
Weathering grade:W3
Fayalite (mol%):17.7±1.0
Ferrosilite (mol%):16.0±1.5
Wollastonite (mol%):1.1±0.9
Classifier:D. Sheikh, Cascadia
Type spec mass (g):20.2
Type spec location:Cascadia
Main mass:James Shelton
Comments:CML 1548; 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. 112, in preparation (2023)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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