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Tiffa 022
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:help 729 g
Recommended:  Mesosiderite    [explanation]

This is 1 of 235 approved meteorites classified as Mesosiderite.   [show all]
Search for other: Mesosiderites, Metal-rich meteorites
Comments: Approved 24 Jul 2021
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:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2021 Jan
Mass (g):729
Shock stage:M-S1
Weathering grade:high
Fayalite (mol%):38.8±0.4
Ferrosilite (mol%):29.6±3.8; 19.2±1.4
Wollastonite (mol%):2.8±1.0; 38.4±0.8
Classifier:K. Metzler, IfP
Type spec mass (g):20
Type spec location:IfP
Main mass:Meteorite Museum & Shop, Stephan Decker, Oberwesel, Germany
Comments:Submitted by K. Metzler, IfP
   and collections
IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)
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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Public domain photographs:
Knut Metzler      

     Recommended::   (19° 29' 11"N, 10° 35' 30"E)

     This is 1 of 51 approved meteorites from Agadez, Niger
     This is 1 of 100 approved meteorites from Niger (plus 5 unapproved names)
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