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

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

This is one of 174 approved meteorites classified as Achondrite-ung. [show all]
Search for others: Achondrites, Ungrouped achondrites.
Comments: Approved Jan 3, 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 northwest of the Bir Ounane site. Salek Mrabih and Sidi al Arbi hold the main masses.

Physical characteristics: The 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 a 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 with 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: 3°16.7766' 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.
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Geography

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

Statistics
This is one of 50 approved meteorites from Gao, Mali (plus one unapproved name).
This is one of 180 approved meteorites from Mali (plus 4 unapproved names).
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