| MetSoc Home Publications Contacts |
|
||
|
||
| Mirabib 022 | |||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Basic information | Name: Mirabib 022 This is an OFFICIAL meteorite name. Abbreviation: There is no official abbreviation for this meteorite. Observed fall: No Year found: 2023 Country: Namibia Mass:  432 g | ||||||||||||||||||||||||||
| Classification history: |
This is 1 of 295 approved meteorites classified as Eucrite-mmict. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||
| Comments: | Approved 13 Sep 2024 | ||||||||||||||||||||||||||
| Writeup |
Writeup from MB 113:
Mirabib 022 23°25.56’S, 15°15.82’E Swakopmund, Namibia Find: 2023 Mar 31 Classification: HED achondrite (Eucrite, monomict) History: The meteorite was found by Mr. T. Kryachko in the Namib desert (Namibia) during the meteorite collection expedition in March 31, 2023. Physical characteristics: A single stone of 432 g in total weight is covered by a black fusion crust. Petrography: The meteorite has brecciated texture. It is composed of 300-1500 µm fragments of pyroxene and feldspar and minor mm-sized rocks fragments joined together by the aggregate of mineral fragments of 20-100 µm in size. The rock fragments are presented by coarse-grained pyroxene-feldspar rocks of igneous gabbroic texture. The phase contacts and the rock fragment outlines are smoothed. Pyroxene contains the fine (<1 µm in width) dissolution lamellae and rare 5-10 µm-sized irregular inclusions of augite. Accessory phases are Fe metal occurred as the inclusions in pyroxene and as the isolated grains up to 200 µm in size, troilite, chromite, silica. The Fe metal and troilite are partly replaced by Fe hydroxide. Geochemistry: Mineral compositions and geochemistry: Coarse-grained rock fragments: pyroxene Fs37.9±0.9Wo2.8±1.4, Fe/Mn=27.4±1.4 (N=5); feldspar An94.8±0.3Ab5.2±0.3 (N=5); Coarse mineral fragments: pyroxene Fs38.5±0.5Wo2.1±0.4 Fe/Mn=26.6±1.2 (N=9); Ca-pyroxene inclusion Fs16.9Wo41.7; feldspar An94.7±0.4 Ab 5.3±0.4 (N=10); Fine mineral fragments: pyroxene Fs37.2±0.8Wo3.7±1.4 Fe/Mn=26.8±0.5 (N=5); Fs16.9Wo41.7; feldspar An94.9±0.3Ab5.1±0.3 (N=10); Fe metal is Ni-free. Chromite is Ti-bearing Al-chromite. Bulk composition: Mg#=56.0±1.6; Fe/Mn=26.0±1.9 (N=3; ICP-AS, I. Gromyak, Vernad.) REE (ppm, N=3; ICP-MS, D. Dogadkin, Vernad.): La 0.180±0.111; Ce 0.540±0.046; Pr 0.086±0.06; Nd 0.443±0.015; Sm 0.154±0.006; Eu 0.225±0.013; Gd 0.236±0.017; Tb 0.044±0.005; Dy 0.320±0.034; Ho 0.073±0.007; Er 0.239±0.035; Tm 0.037±0.004; Yb 0.254±0.029; Lu 0.040±0.003. Classification: Based on the brecciated texture of the meteorite, similar texture of the rock fragments, and similarity of composition of minerals in rock and mineral fragments the meteorite is classified as a monomict eucrite breccia. The Mg#, Fe/Mn, An values and REE distribution of the meteorite relate it to the cumulate eucrites. Weathering of the meteorite is minimal. Specimens: Type specimen of 58.3 g and thin section are on deposit in Vernad. Mr. T. Kryachko holds the main mass. | ||||||||||||||||||||||||||
| Data from: MB113 Table 0 Line 0: |
|
||||||||||||||||||||||||||
| Institutions and collections |
TM: Geoscience Museum, Transvaal Museum, P. O. Box 413, Pretoria 0001, South Africa (institutional address; updated 3 Mar 2011) Vernad: Vernadsky Institute of Geochemistry and Analytical Chemistry, Russia (institutional address; updated 21 Feb 2016) |
||||||||||||||||||||||||||
| Catalogs: |
| ||||||||||||||||||||||||||
| References: | Published in Meteoritical Bulletin, no. 113, in preparation (2024)
| ||||||||||||||||||||||||||
Geography:
|
Statistics: This is 1 of 37 approved meteorites from Swakopmund, Namibia This is 1 of 50 approved meteorites from Namibia (plus 1 impact crater) | ||||||||||||||||||||||||||
| Proximity search: | |||||||||||||||||||||||||||