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Tanezrouft 091
Basic information Name: Tanezrouft 091
     This is an OFFICIAL meteorite name.
Abbreviation: Tnz 091
Observed fall: No
Year found: 2020
Country: Algeria
Mass:help 4.99 kg
Classification
  history:
Recommended:  Mesosiderite    [explanation]

This is 1 of 205 approved meteorites classified as Mesosiderite.   [show all]
Search for other: Mesosiderites, Metal-rich meteorites
Comments: Approved 5 Dec 2020
Writeuphelp
Writeup from MB 109:

Tanezrouft 091 (Tnz 091)        24°15.85’N, 0°09.64’W

Adrar, Algeria

Purchased: 2020

Classification: Mesosiderite

History: Two stones totaling 4988 g were found near Adrar, Algeria. Carlos Muñecas Muñoz purchased the samples from a dealer in Morocco in 2020.

Physical characteristics: Samples are dark brown in color, rounded, and lack fusion crust. Rounded metal nodules protrude through the surface. A cut face shows the interior is composed of a breccia containing: metal grains, cm-sized rounded metal nodules and silicate clasts (up to 4 cm) and mineral grains (up to 0.5 cm).

Petrography: Description and Classification (A. Love, App): Sample is a breccia composed of (vol%): cm-sized rounded metal nodules (3); cm-sized rounded lithic clasts (10) with cumulate and brecciated textures, mineral clasts set within a matrix of poikiloblastic orthopyroxene plagioclase and silicates and metal (~35vol%). Modal percentages (vol%) of silicates (image thresholding of 20 backscattered electron images): orthopyroxene (60), plagioclase (31), olivine (5) and a lath-shaped silica polymorph (4). Matrix pyroxenes are inverted and show blebby and lamellar exsolution. Olivine shows well-developed reaction coronas some of which have replaced entire grains. Grain boundaries between silicates are sutured. Additional minerals are: kamacite, taenite, lath-shaped Si polymorph, apatite, troilite, chromite, trace ilmenite.

Geochemistry: (A. Love, App) Olivine, Fa36.6±7.7 (Fa25.7-44.3, Fe/Mn=40.4±2.5, n=5); zoned low-Ca pyroxene, Fs30.8±2.5Wo2.1±0.7 (Fe/Mn=27.5±1.4, n=6); matrix, Fs37.5±1.3Wo3.2±0.1 (Fe/Mn=23.6±0.5, n=4); high-Ca pyroxene, Fs18.1±1.7Wo40.6±4.2 (n=3). Plagioclase, An92.4±0.4Or0.1±0.1 (n=5).

Classification: Mesosiderite (estimated class) A3. Mesosiderite Class A based on texture, metal abundance, magnetic susceptibility and modal silicate abundance of plagioclase and Opx. Metamorphic class 3 based on recrystallization textures of silicates and absence of pigeonite.

Specimens: Carlos Muñecas (Expometeoritos) holds the 2525 g main mass. A 24.46 g slice and polished mount are on deposit at App.

Data from:
  MB109
  Table 0
  Line 0:
State/Prov/County:Adrar
Place of purchase:Morocco
Date:P 2020
Latitude:24°15.85'N
Longitude:0°09.64'W
Mass (g):4988
Pieces:2
Class:Mesosiderite
Shock stage:low
Weathering grade:low
Fayalite (mol%):36.6±7.7
Ferrosilite (mol%):30.8±2.5; 37.5±1.3; 18.1±1.7
Wollastonite (mol%):2.1±0.7; 3.2±0.1; 40.6±4.2
Magnetic suscept.:5.82
Classifier:A. Love, App
Type spec mass (g):24.46
Type spec location:App
Main mass:Carlos Muñecas (Expometeoritos)
Comments:Submitted by Anthony Love
Institutions
   and collections
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Geography:

Algeria
Coordinates:
     Recommended::   (24° 15' 51"N, 0° 9' 38"W)

Statistics:
     This is 1 of 162 approved meteorites from Adrar, Algeria (plus 1 unapproved name)
     This is 1 of 1088 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)
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