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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: ![]() | ||||||||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 226 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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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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Photos: |
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Geography:![]() |
Statistics: This is 1 of 51 approved meteorites from Agadez, Niger This is 1 of 94 approved meteorites from Niger (plus 3 unapproved names) | ||||||||||||||||||||||||||||||||||||
Proximity search: |