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| Tin-Essako 001 | |||||||||||||||||||||||||||||||||
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| Basic information | Name: Tin-Essako 001 This is an OFFICIAL meteorite name. Abbreviation: TE 001 Observed fall: No Year found: 2021 Country: Mali Mass:  4.3 kg | ||||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 118 approved meteorites classified as Achondrite-ung. [show all] Search for other: Achondrites, Ungrouped achondrites | ||||||||||||||||||||||||||||||||
| Comments: | Approved 4 Dec 2021 | ||||||||||||||||||||||||||||||||
| Writeup |
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: |
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| 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) |
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| References: | Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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Geography:
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Statistics: This is 1 of 13 approved meteorites from Gao, Mali (plus 1 unapproved name) This is 1 of 69 approved meteorites from Mali (plus 1 unapproved name) | ||||||||||||||||||||||||||||||||
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