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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:
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 Meteoritical Bulletin, no. 112, in preparation (2023)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1315 approved meteorites from Algeria (plus 30 unapproved names) (plus 4 impact craters)

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