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| Tanezrouft 091 | |||||||||||||||||||||||||||||||||||||||
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| Basic information | Name: Tanezrouft 091 This is an OFFICIAL meteorite name. Abbreviation: Tnz 091 Observed fall: No Year found: 2020 Country: Algeria Mass:  4.99 kg | ||||||||||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 240 approved meteorites classified as Mesosiderite. [show all] Search for other: Mesosiderites, Metal-rich meteorites | ||||||||||||||||||||||||||||||||||||||
| Comments: | Approved 5 Dec 2020 | ||||||||||||||||||||||||||||||||||||||
| Writeup |
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: |
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| Institutions and collections |
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013) |
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| References: | Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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| Photos: |
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Geography:
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Statistics: This is 1 of 187 approved meteorites from Adrar, Algeria (plus 1 unapproved name) This is 1 of 1270 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters) | ||||||||||||||||||||||||||||||||||||||
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