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Northwest Africa 15805
Basic information Name: Northwest Africa 15805
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15805
Observed fall: No
Year found: 2021
Country: Algeria
Mass:help 352 g
Classification
  history:
Meteoritical Bulletin:  MB 112  (2024)  Howardite
Recommended:  Howardite    [explanation]

This is 1 of 453 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 30 Jul 2023
Writeuphelp
Writeup from MB 112:

Northwest Africa 15805 (NWA 15805)

Algeria

Purchased: 2021

Classification: HED achondrite (Howardite)

History: Found in Algeria; sold to Edwin Thompson in 2021 by a meteorite seller in Goulmima, Morocco; subsequently sold to Steve Brittenham in 2022.

Physical characteristics: Single stone with minimal dark fusion crust.

Petrography: (D. Sheikh, Cascadia) Sample is a breccia comprised of sub-angular to sub-rounded mm-sized lithic and mineral clasts (largest ~6 mm) set within a fine-grained matrix containing accessory SiO2-rich glass and ilmenite. Lithic clast lithologies include: 1) blocky orthopyroxene clasts (diogenite clasts, ~55 %), and 2) clasts (both cumulate and basaltic) composed of pigeonite (some exsolved), augite (some exsolved), low-Ca pyroxene, and calcic plagioclase (eucrite clasts, ~45 %).

Geochemistry: Diogenite clasts: Low-Ca Pyroxene (Fs25.9±5.3Wo2.6±1.1, range Fs16.2-37.1Wo0.4-4.8, Fe/Mn=28±3, n=23); Eucrite clasts: Low-Ca Pyroxene (Fs49.1±6.1Wo2.7±1.0, range Fs40.9-60.2Wo1.1-4.5, Fe/Mn=29±2, n=11), Pigeonite (Fs50.7±12.5Wo9.7±5.1, range Fs27.7-64.2Wo5.5-22.4, Fe/Mn=29±2, n=20), High-Ca Pyroxene (Fs29.2±15.2Wo39.9±4.3, range Fs16.5-64.0Wo30.2-44.6, Fe/Mn=27±5, n=8), Calcic Plagioclase (An92.4±3.0, range An88.4-97.0, n=16).

Classification: HED achondrite (Howardite).

Specimens: 24 g at Cascadia, main mass with Steve Brittenham.

Data from:
  MB112
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2021
Mass (g):352
Pieces:1
Class:Howardite
Shock stage:moderate
Weathering grade:low
Ferrosilite (mol%):25.9±5.3, 49.1±6.1, 50.7±12.5, 29.2±15.2
Wollastonite (mol%):2.6±1.1, 2.7±1.0, 9.7±5.1, 39.9±4.3
Classifier:D. Sheikh, Cascadia
Type spec mass (g):24
Type spec location:Cascadia
Main mass:Steve Brittenham
Comments:CML 1517; 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)
Thompson: Edwin Thompson, 5150 Dawn St., Lake Oswego, OR 97035, United States (private address)
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:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1376 approved meteorites from Algeria (plus 31 unapproved names) (plus 4 impact craters)

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