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Northwest Africa 15985
Basic information Name: Northwest Africa 15985
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15985
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 7.6 g
Meteoritical Bulletin:  MB 112  (2024)  H4-melt breccia
Recommended:  H4-melt breccia    [explanation]

This is 1 of 12 approved meteorites (plus 1 unapproved name) classified as H4-melt breccia.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 30 Jul 2023
Writeup from MB 112:

Northwest Africa 15985 (NWA 15985)

(Northwest Africa)

Purchased: 5 September 2022

Classification: Ordinary chondrite (H4, melt breccia)

History: Purchased online by Mikey Boland on Septermber 5th, 2022.

Physical characteristics: Single stone with dark brown fusion crust.

Petrography: (D. Sheikh, Cascadia) Sample has two observable lithologies: Lith 1) an equilibrated ordinary chondrite containing accessory Fe-Ni metal, troilite, and chromite; Lith 2) A melt breccia comprised of Lith 1 fragments set within a melt rock matrix.

Geochemistry: Olivine (Fa18.6±0.5, range Fa17.6-19.6, n=24), Low-Ca Pyroxene (Fs16.5±0.4Wo1.7±0.1, range Fs15.2-17.0Wo1.5-1.9, n=20).

Classification: Ordinary chondrite (H4, melt breccia).

Specimens: 1.85 g at Cascadia, main mass with Mikey Boland.

Data from:
  Table 0
  Line 0:
Place of purchase:Online
Date:P 5 September 2022
Mass (g):7.63
Class:H4-melt breccia
Shock stage:S4
Weathering grade:W2
Fayalite (mol%):18.6±0.5
Ferrosilite (mol%):16.5±0.4
Wollastonite (mol%):1.7±0.1
Classifier:D. Sheikh, Cascadia
Type spec mass (g):1.85
Type spec location:Cascadia
Main mass:Mikey Boland
Comments:CML 1620; submitted by Daniel Sheikh
   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)
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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     This is 1 of 9829 approved meteorites from (Northwest Africa) (plus 1851 unapproved names)

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