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| Tiffa 022 | |||||||||||||||||||||||||||||||||||||
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| Basic information | Name: Tiffa 022 This is an OFFICIAL meteorite name. Abbreviation: There is no official abbreviation for this meteorite. Observed fall: No Year found: 2021 Country: Niger Mass:  729 g | ||||||||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 244 approved meteorites classified as Mesosiderite. [show all] Search for other: Mesosiderites, Metal-rich meteorites | ||||||||||||||||||||||||||||||||||||
| Comments: | Approved 24 Jul 2021 | ||||||||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 110:
Tiffa 022 19°29’10.5’’N, 10°35’29.5’’E Agadez, Niger Purchased: 2021 Jan Classification: Mesosiderite History: Purchased from a moroccan mineral dealer. Found in Niger in September 2019. Petrography: (K. Metzler, IfP) Achondritic breccia, consisting of monomineralic (low-Ca pyroxene) and polymineralic (low-Ca pyroxene + plagioclase) clasts up to 2 mm, set in small amounts of finer grained, recrystallized matrix. Ca-rich pyroxene with thin exsolution lamellae is poikilitically enclosed in low-Ca pyroxene. Modal amount of plagioclase >10 vol%. Rare olivine grains up to 1.3 mm occur, surrounded by reaction zones consisting of low-Ca pyroxene and Cr-spinel. Severe metal oxidation with crisscrossed oxide veins throughout the sample. Accessories are a silica polymorph, merrillite, and troilite. Metal: sample has 29 vol% metal, and nearly all metal in this sample has been converted to oxidation products. Geochemistry: Mineral compositions and geochemistry: Mean low-Ca pyroxene composition Fs29.6±3.8 Wo2.8±1.0 (Fs22.5-37.4 Wo1.6-4.4); mean Fe/Mn (at.): 27.8; n=20. Mean Ca-rich pyroxene composition Fs19.2±1.4 Wo38.4±0.8 (Fs17.5-20.6 Wo37.3-39.3); mean Fe/Mn (at): 18.8; n=5. Mean olivine composition: Fa38.8±0.4 (Fa38.2-39.1); mean Fe/Mn (at.): 35.7; n=6. Mean plagioclase composition An90.6±3.1 Or0.0±0.1 (An84.9-94.3 Or0.0-0.3); n=14. Metal: Only one metal grain (core of a large oxidized grain) was detected in the investigated thin section (kamacite; ~7 at% Ni). Classification: Mesosiderite, based on texture, mineralogical composition, and mineral chemistry. Proposed subtype B2 (Plagioclase 10-25%, moderately recrystallized matrix). | ||||||||||||||||||||||||||||||||||||
| Data from: MB110 Table 0 Line 0: |
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| Institutions and collections |
IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012) |
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| 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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Geography:
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Statistics: This is 1 of 51 approved meteorites from Agadez, Niger This is 1 of 106 approved meteorites from Niger (plus 4 unapproved names) | ||||||||||||||||||||||||||||||||||||
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