Bir Ounane 004 - Ungrouped achondrite meteorite - 203.8 g - (1)

Country: Mali
Mass:help 12.16 kg
Classification
history:
Meteoritical Bulletin: MB 112 (2024) Achondrite-ung
Recommended: Achondrite-ung [explanation]

This is 1 of 174 approved meteorites classified as Achondrite-ung. [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 3 Jan 2024
Writeuphelp
Writeup from MB 112:
Bir Ounane 004 21º51.8568’N, 3º16.7766’W

Gao, Mali

Find: 2023

Classification: Ungrouped achondrite

History: Many samples weighing a total of 12.158 kg were found in Mali 3.5 Km NW of the Bir Ounane001 find. Salek Mrabih and Sidi al Arbi hold the main masses.

Physical characteristics: Stone has a flattened irregular shape and lacks a fusion crust. The cut face is dark, orangish brown in color and shows a poikilitic texture.

Petrography: Description and classification (A. Love, App) Sample shows poikiloblastic texture composed of: 0.5-mm to 1-cm sized clinoenstatite, olivine, augite, twinned plagioclase, FeNi metal and troilite. Olivine, augite and plagioclase occur as interstitial phases and as chadacrysts. Olivine also occurs in lumps of equigranular grains interstitial to clinoenstatite oikocrysts. Additional minerals are: troilite, schreibersite and daubréelite.

Geochemistry: (A. Love, App) Olivine (Fa1.0±0.1, Fe/Mn=4.1±0.8, n=12); low Ca-pyroxene (Fs1.3±0.1Wo0.9±0.4, Fe/Mn=2.7±0.8 n=12); high Ca-pyroxene (Fs0.8±0.3Wo40.3±1.0, Fe/Mn=2.3±0.8 n=8); plagioclase (An36.9±8.1Or0.2_0.1, n=6).

Classification: primitive achondrite (ungrouped) Based on petrographic characteristics, reduced mineral compositions and find coordinates, this sample is possibly paired to the ungrouped achondrites Bir Ounane 001 and 003.

Specimens: Salek Mrabih (Dominion Meteors) holds the main masses. A polished thin section and an endcut weighing 21.4 g are on deposit at App.

Data from:
MB112
Table 0
Line 0:
State/Prov/County: Gao
Date: 2023
Latitude: 21º51.8568'N
Longitude: 3º16.7766'W
Mass (g): 12158
Pieces: many
Class: Achondrite-ung
Shock stage: U-S2
Weathering grade: W2
Fayalite (mol%): 1.0±0.1
Ferrosilite (mol%): 1.3±0.1; 0.8±0.3
Wollastonite (mol%): 0.9±0.4; 40.3±1.0
Classifier: A. Love, App
Type spec mass (g): 21.4
Type spec location: App
Main mass: Salek Mrabih (Dominion Meteors)
Comments: Submitted by Anthony Love
Institutions
and collections App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 2013-03-07)
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. ?
Find references in NASA ADS: NASA ADS
Find references in Google Scholar: Google Scholar
Geography:

Mali
Coordinates:
Recommended:: (21° 51' 51"N, 3° 16' 47"W)

Statistics:
This is 1 of 50 approved meteorites from Gao, Mali (plus 1 unapproved name)
This is 1 of 180 approved meteorites from Mali (plus 4 unapproved names)
Proximity search:
Find nearby meteorites: enter search radius (km):
Crosslinks:
This lists all records that are linked to this record and to each other.
Also see:
This lists the most popular meteorites among people who looked up this meteorite.