| MetSoc Home Publications Contacts |
|
||
|
||
| Twayla 001 | |||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Basic information | Name: Twayla 001 This is an OFFICIAL meteorite name. Abbreviation: There is no official abbreviation for this meteorite. Observed fall: No, it is doubtful that it is a fall Year found: 2017 Country: Western Sahara Mass:  500 g | ||||||||||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 453 approved meteorites classified as Howardite. [show all] Search for other: Achondrites, HED achondrites, and Howardites | ||||||||||||||||||||||||||||||||||||||
| Comments: | Approved 14 Dec 2018 | ||||||||||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 107:
Twayla 001 ~26°50.2’N, ~9°11.6’W Saguia el Hamra, Western Sahara Find, doubtful fall: 2014 Dec Classification: HED achondrite (Howardite) History: The family of nomad Lahsen Duine spent the winter of 2014/2015 in the Wad La’waj Talli area, nearly 70 km NE of Bir Lahlou. Short before the end of he year, they were awakened by lightning, followed by a curious whistling noise. In March 2015, the children discovered two black stones on the ground, in the grassy scrub, while they were catching their goats. The stones were discovered within several hundred m of each other. The bigger stone was purchased in Ouarzazate in March 2017. Physical characteristics: Two nearly complete individuals of 318 and approximately 150 g with glossy black fusion crust. Cut face shows a breccia with fragmental light and darker clasts set in a light-gray groundmass. Some fractures show penetrating fusion curst; no traces of terrestrial fillings are recognizable. Petrography: (R. Bartoschewitz, Bart) Polymict breccia with at least three distinct lithologies: diogenite, eucrite and anorthosite. Ubiquitous iron-nickel metal, Fe-sulfide and chromite present. Geochemistry: (R. Bartoschewitz, Bart, P. Appel and B. Mader, Kiel) Diogenite pyroxene Fs35.0±0.7Wo5.2±1.4, Fe/Mn=27, n=8; chromite CRAL 78.3±1.2, FFM 88.6±3.6. Eucrite pyroxene Fs40.0±1.8Wo9.4±2.5, Fe/Mn=30, n=15; plagioclase An89.7±1.5Or0.3±0.1, n=14; olivine Fa38.5, Fe/Mn=34, n=1. Anorthositic clast An93.0±0.8Or0.3±0.1, n=5. Matrix pyroxene Fs35.0±3.2Wo5.6±0.9, Fe/Mn=28, n=9; plagioclase An91.9±2.1Or0.3±0.1, n=2; olivine Fa46.3±12.7, Fe/Mn=51 , n=2; chromite CRAL 79.4±2.0, FFM 90.4±0.4; kamazite Ni 0.0-2.0, Co 0.2-0.7 wt-%, n=15, troilite. Classification: HED achondrite (howardite) Specimens: 20.0 g on deposit at Kiel, main mass with Dieter Janek, 21.5 g Bart. | ||||||||||||||||||||||||||||||||||||||
| Data from: MB107 Table 0 Line 0: |
|
||||||||||||||||||||||||||||||||||||||
| Institutions and collections |
Kiel: Geologisches und Mineralogisches Museum, Institut für Geowissenschaften, Christian-Albrechts-Universität Kiel, Ludewig-Mayn-Str. 10, D-24118 Kiel, Germany, Germany (institutional address; updated 13 Sep 2013) Bart: Bartoschewitz Meteorite Laboratory, Weiland 37, D-38518 Gifhorn, Germany; Website (private address; updated 30 Nov 2019) |
||||||||||||||||||||||||||||||||||||||
| Catalogs: |
| ||||||||||||||||||||||||||||||||||||||
| References: | Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
| ||||||||||||||||||||||||||||||||||||||
| Photos: |
| ||||||||||||||||||||||||||||||||||||||
Geography:
|
Statistics: This is 1 of 109 approved meteorites from Saguia el Hamra, Western Sahara (plus 1 unapproved name) This is 1 of 272 approved meteorites from Western Sahara (plus 20 unapproved names) | ||||||||||||||||||||||||||||||||||||||
| Proximity search: | |||||||||||||||||||||||||||||||||||||||