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Tin-Essako 001
Basic information Name: Tin-Essako 001
     This is an OFFICIAL meteorite name.
Abbreviation: TE 001
Observed fall: No
Year found: 2021
Country: Mali
Mass:help 4.3 kg
Classification
  history:
Recommended:  Achondrite-ung    [explanation]

This is 1 of 121 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 4 Dec 2021
Writeuphelp
Writeup from MB 110:

Tin-Essako 001 (TE 001)        18.280242, 2.094914

Gao, Mali

Find: 2020

Classification: Ungrouped achondrite

History: Purchased by Jay Piatek in 2021 from meteorite dealers Hassan Ounir and Ali Benamar. Found in 2020 by a nomad in Mali approximately 120 km east of the town of Kidal.

Physical characteristics: Oriented single stone, irregular surface, dark colored exterior patina with some reddish-brown oxidation patches. Saw cuts reveal a stony-iron appearing interior with a heterogenous distribution of metal and silicate grains and domains. Cut metal surfaces appear fresh with only minor oxidation. Silicates are very dark brown in color.

Petrography: (C. Agee, M. Spilde, UNM) This meteorite consists of approximately 50% silicates and 50% metal. The dominant silicate mineral is olivine; metal consists of kamacite. Backscatter electron imaging gives the approximate modal silicate abundances: 85-90% olivine, 10% plagioclase, and minor chromite, and quench melt pockets. Small (<100 μm) carbon rich phases (possibly graphite) at olivine-metal grain boundaries and as inclusions in metal were found. No pyroxenes, sulfides, or diamonds were detected in the microprobe mount.

Geochemistry: (C. Agee, M. Spilde, UNM) Olivine Fa25.0±0.1, Fe/Mn=51±2, Cr2O3=0.27±0.02 wt%, CaO=0.24±0.01 wt%, n=8; plagioclase An54.0±1.5Or0.2±0.1Ab45.8±1.5, n=7; melt pocket SiO2=76.0±5.5, Al2O3=16.2±3.6, CaO=2.2±0.2, FeO=1.0±0.1, Na2O=5.1±1.3, all wt%, n=2; kamacite Fe=93.2±1.1, Ni=4.9±0.2, Co=0.46±0.02 (wt%), n=5. Oxygen isotopes (K. Ziegler, UNM): 3 acid-washed fragments analyzed by laser fluorination gave δ18O= 7.374, 8.164, 9.305; δ17O= 3.203, 3.663, 4.288; Δ17O= -0.690, -0.647, -0.625 (linearized, all per mil, TFL slope=0.528).

Classification: Ungrouped achondrite, metal-rich. The oxygen isotope values of this meteorite plot at the high end of the ureilite trend, and it possesses olivine with Fa, Fe/Mn, Cr2O3, and CaO within the range of ureilites, suggesting ureilite affinity, however it lacks both pigeonite and low-Ca pyroxene.

Specimens: 20 g including a probe mount on deposit at UNM, Jay Piatek holds the main mass.

Data from:
  MB110
  Table 0
  Line 0:
State/Prov/County:Gao
Place of purchase:Morocco
Date:2020
Latitude:18.280242
Longitude:2.094914
Mass (g):4303
Pieces:1
Class:Achondrite-ung
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):25.0±0.1
Classifier:C. Agee, UNM
Type spec mass (g):20
Type spec location:UNM
Main mass:Jay Piatek
Comments:Submitted by C.Agee
Plots: O isotopes:  
Institutions
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
Catalogs:
References: Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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Photos:
CreditPhotos
Public domain photographs:
Carl Agee   
Geography:

Mali
Coordinates:
     Recommended::   (18° 16' 49"N, 2° 5' 42"E)

Statistics:
     This is 1 of 18 approved meteorites from Gao, Mali (plus 1 unapproved name)
     This is 1 of 79 approved meteorites from Mali (plus 2 unapproved names)
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