|
Northwest Africa 12757 | |||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Basic information | Name: Northwest Africa 12757 This is an OFFICIAL meteorite name. Abbreviation: NWA 12757 Observed fall: No Year found: 2015 Country: (Northwest Africa) Mass: 298 g | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 595 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||
Comments: | Approved 18 Aug 2019 | ||||||||||||||||||||||||||||
Writeup |
Writeup from MB 108:
Northwest Africa 12757 (NWA 12757) (Northwest Africa) Purchased: 2015 Classification: HED achondrite (Eucrite) History: The meteorite was purchased from a local meteorite dealer in Morocco. Physical characteristics: Grayish rock with some fusion crust. Petrography: Monomict breccia composed of up to 6 mm sized mineral fragments which are predominantly exsolved pyroxene and calcic plagioclase. Pyroxene is either augite with low-Ca exsolution lamellae or vice versa. Plagioclase shows signs of recrystallization. Minor phases include Fe-rich olivine, silica, FeS, chromite, and barite; no metallic Fe has been found. Contains shock melt. Geochemistry: low-Ca pyroxene: Fs65.7±2.4Wo2.9±0.8 (Fs60.3-67.6Wo2.2-4.9, n=12, FeO/MnO=25-34); Ca-pyroxene: Fs29.3±2.5Wo42.5±0.7 (Fs26.4-32.6Wo40.6-43.0, n=11, FeO/MnO=29-35); olivine: Fa81.6±3.2 (Fa75.6-84.8, n=19, FeO/MnO=37±7); calcic plagioclase: An90.7±1.1 (An88.2-92.0, n=12) | ||||||||||||||||||||||||||||
Data from: MB108 Table 0 Line 0: |
|
||||||||||||||||||||||||||||
Institutions and collections |
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011) |
||||||||||||||||||||||||||||
Catalogs: |
| ||||||||||||||||||||||||||||
References: | Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
| ||||||||||||||||||||||||||||
Geography: |
Statistics: This is 1 of 9589 approved meteorites from (Northwest Africa) (plus 1869 unapproved names) | ||||||||||||||||||||||||||||
Also see: |
This lists the most popular meteorites among people who looked up this meteorite.
| ||||||||||||||||||||||||||||
Revision history: |
This lists important revisions made to data for this record.
|