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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:
Meteoritical Bulletin:  MB 112  (2024)  H4
Recommended:  H4    [explanation]

This is 1 of 6548 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 Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Cartier C., Consolmagno G., Goodrich C., Greshake A., Gross J., Joy K. H., Miao B. and Zhang B. (2024) The Meteoritical Bulletin, no. 112. Meteoritics & Planetary Science 59, 1820–1823. ?
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Geography: 
Coordinates:Unknown.

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

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