Taoudenni Achondrite Diogenite Meteorite 46.3g end cut rediscovered from Mali

Description

TAOUDENNI
DIOGENITE METEORITE
46.3 GRAM END CUT
AS IT TURNS OUT THIS METEORITE WAS DISCOVERED BACK IN 2007, RECENTLY REDISCOVERED ON OCTOBER 31, 2020. I SUBMITTED COMPLETE GPS COORDINATES AND ANTHONY LOVE PERFORMED A DETAILED CLASSIFICATION. AFTER REVIEW THE METEORITICAL SOCIETY DECIDED TO ADOPT THE ADDITIONAL DISCOVERED SPECIMENS UNDER THE TKW.
History: Multiple samples with a combined weight of 12kg were found the October 31,2020 by
Salek Lehmendi in Northern Mali, Umm Qutb, near Taoudni. John Higgins purchased 2086g
from a meteorite dealer. Additional masses were purchased by Jason Phillips and several
anonymous dealers.
Coordinates: 22o6928N 3o58.7383W
Physical characteristics: Some samples display small patches of black fusion crust. Samples are
irregular shaped, have a yellowish-orange weathered surface and dark green brecciated interior
composed of cm-sized orthopyroxene crystals set within a comminuted matrix of similar
materials.
Petrography: Description and classification (A. Love, App) Sample is a breccia composed of
orthopyroxene crystals and brecciated grains ranging in size some of which contain irregular-
shaped masses of olivine and ubiquitous 20μm rounded to euhedral chromite. Additional
minerals are 10μm inclusions of plagioclase, troilite and FeOH minerals (presumed to be former
FeNi). Shock: Olivine shows planar fractures and undulatory extinction. Blebs of sulfides occur within
crystals and may represent relict FeS veinlets injected during a prior shock event.
Weathering: FeNi metals have been oxidized to FeOH. Sample shows some staining from iron
oxide minerals in brecciated regions.  Magnetic Susceptibility: Mass magnetic susceptibility was measured using a ZH Instruments SM-30 pocket MS meter. Quadruplicate measurements of an 11.08g end piece produced log  x
10-9 m3 /kg= 3.18. Geochemistry: A. Love, App) Geochemistry of both samples was measured using the JEOL
ITS300 SEM with Oxford XMax EDS in the Dewel Microscopy Lab at Appalachian State
University. An accelerating voltage of 20kV was used to analyze 3 spots per grain. Compositions
are unequilibrated. Olivine (Fa31.6±0.8, Fe/Mn=43.1±0.8, n=5); low Ca pyroxene (Fs29.7±0.7Wo1.6±0.2,
Fe/Mn=24.5±1.0, n=17). Classification: HED achondrite (diogenite). Based on textures and mineral compositions, sample
is a brecciated olivine-bearing diogenite.
OFFICIAL CLASSIFICATION DATA SOURCE:
The Meteoritical Society
International Society for Meteoritics and Planetary Science
Lunar and Planetary Institute
Meteoritical Bulletin Database
Taoudenni
Basic information
Name:
Taoudenni
This is an OFFICIAL meteorite name.
Abbreviation:
There is no official abbreviation for this meteorite.
Observed fall:
No
Year found:
2007
Country:
Mali
Mass:
24.37 kg
Classification
history:
Meteoritical Bulletin:
MB 98
(2010)
Diogenite
Recommended:
Diogenite
[explanation]
This is 1 of 447 approved meteorites classified as Diogenite.
[show all]
Search for other:
Achondrites
,
Diogenites
, and
HED achondrites
Comments:
Approved 10 Mar 2010
Writeup
Writeup from
MB online:
Taoudenni
22°47.5’N, 3°58.0’W
Gao, Mali
Found: Dec. 2007
Classification: HED achondrite (Diogenite)
History
: A Moroccan meteorite hunter (Dhamen Ouled Ali) looking for pieces of the Erg Chech fall (
Chergach
) found this 23 kg single stone by chance, 15 km north of the Taoudenni salines.
Physical characteristics
: One single 24,370 g stone, with patches of fusion crust (5 to 10 % approximately). log χ = 2.8.
Petrography
: A. Jambon, O. Boudouma, D. Badia,
UPVI
, studied one polished section by EMPA and SEM. The meteorite has a cumulate texture, dominantly orthopyroxene, with minor amounts of poikilitally enclosed olivine and chromite/pyrrhotite and interstitial plagioclase and chromite. Rare silica and kamacite (mostly weathered) occur. A few clusters of subhedral olivine are irregularly distributed (according to photographs of the whole stone). Mode from a BSE image on a polished section of about 2 cm
2
: orthopyroxene = 87%, olivine = 7%, chromite = 1.6%, plagioclase = 3%.
Geochemistry
: Mineral compositions and geochemistry: Abundant low-Ca pyroxene : En
69
Fs
26
Wo
4
; Cr
2
O
3
= 0.7%; FeO/MnO = 31. Olivine Fa
34
; Cr
2
O
3
= 0.03%, CaO = 0.08 %; FeO/MnO = 51. Minor high-Ca pyroxene: En
45
Fs
13
Wo
42.
Plagioclase An
87
Ab
12
Or
1.
Chromite: Mg# = 0.24; Cr/(Cr+Al) = 0.69. Kamacite has Ni = 12%.
Classification
: Diogenite. Weathering: moderate. No shock features.
Specimens
: Type specimens: A specimen of 31 g and one polished section are on deposit at
UPVI
. A. Habibi (Erfoud) holds the main mass.
Data from:
MB98
Table 1
Line 18:
State/Prov/County:
Gao
Date:
Dec. 2007
Latitude:
22°47.5'N
Longitude:
3°58.0'W
Mass (g):
24370
Pieces:
1
Class:
Diogenite
Fayalite (mol%):
34
Ferrosilite (mol%):
69
Wollastonite (mol%):
4
Magnetic suscept.:
2.8
Classifier:
A. Jambon, O. Boudouma, D. Badia, UPVI
Type spec mass (g):
31
Type spec location:
UPVI
Main mass:
AHabibi
Finder:
Dhamen Ouled Ali
Comments:
Submitted by A. Jambon
Institutions
and collections
UPVI
: Université Pierre et Marie Curie (Paris VI),
AHabibi
: Palms Hotel Club
Catalogs:
References:
Published in
Meteoritical Bulletin, no. 98, MAPS 45, 1530-1551 (2010)
Geography:
Coordinates:
Recommended:
:
(22° 47' 30"N, 3° 58' 0"W)
Statistics:
This is 1 of 6 approved meteorites from
Gao, Mali
(plus 1 unapproved name)
This is 1 of 44 approved meteorites from
Mali
(plus 1 unapproved name)
GUARANTEED AUTHENTICITY
Member of the Meteoritical Society and the IMCA
MEMBER # 9822  JOHN HIGGINS. THIS METEORITE IS FROM MY PERSONAL COLLECTION.
The authenticity of this meteorite has a 100% guarantee. Signed Certificate of Authenticity Included. First class delivery and provenance provided.
1cm scale cube for reference purposes.
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