header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 26 Oct 2021
Search for: Search type: Search limits: Display: Publication:
Names
Text help
Places
Classes
Years
Contains
Starts with
Exact
Sounds like
NonAntarctic
Falls  Non-NWAs
What's new
  in the last:
Include past classifications in search
Limit to approved meteorite names
Search text:  
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
Classification
  history:
Recommended:  Mesosiderite    [explanation]

This is 1 of 217 approved meteorites classified as Mesosiderite.   [show all]
Search for other: Mesosiderites, Metal-rich meteorites
Comments: Approved 24 Jul 2021
Writeuphelp
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:
State/Prov/County:Agadez
Place of purchase:Morocco
Date:P 2021 Jan
Latitude:19°29'10.5''N
Longitude:10°35'29.5''E
Mass (g):729
Pieces:6
Class:Mesosiderite
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
Institutions
   and collections
IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
Knut Metzler      
Geography:

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

Statistics:
     This is 1 of 49 approved meteorites from Agadez, Niger
     This is 1 of 77 approved meteorites from Niger (plus 3 unapproved names)
Proximity search:
Find nearby meteorites: enter search radius (km):

Direct link to this page