OUT 19131

Classification: Ordinary Chondrite LL6

Explainer: This means that the sample is from an asteroid parent body. It represents early Solar System material which includes chondrules (small round melt droplets). It is from a very common type of chondrule-bearing meteorite called the ordinary chondrite class. This particular type is an ‘LL’ type – meaning it has very low concentrations of iron (i.e. iron metal). The meteorite is also a type 6 sample – which means that it has been greatly metamorphosed (heated and/or held under high pressure). You can see more about where this sample fits into the meteorite classification scheme by looking at this page.

Description: Taken from the Meteoritical Bulletin for OUT 19131

History: The meteorite was recovered as part of the Lost Meteorites of Antarctica project, which was funded in the UK by the Leverhulme Trust and supported by the British Antarctic Survey and the University of Manchester. These samples were collected as part of the project’s second field season in austral summer December 2019 – January 2020 by a six person field party consisting of Katherine Joy, Geoffrey Evatt, Romain Tartèse, Wouter Van Verre, Taff Raymond and Rob Taylor. Found on blue ice surface at Outer Recovery 4 (south) Icefields. Altitude 1547 m.

Physical characteristics: Mass: 941.072 g. Pieces: 1. Dimensions: 12 × 8 × 4 cm. A blocky, whole, light-gray stone with 60% fusion crust and black, glassy exterior. Black, glassy fusion crust.

Petrography: Equilibrated texture with very poorly defined chondrules (up to 1 mm in diameter). Metal and sulfide grains up to 0.4 mm distributed throughout..

Mineral compositions and geochemistry: All analyses by EPMA. Olivine Fa33.2±0.3 (N=10), Pyroxene Fs27.0±0.6Wo1.6±0.3 (N=12). Plagioclase An10.2±0.2Ab83.8±0.7Or6.1±0.5 (N=3).

Specimens: 941.07 g type specimen (main mass) held at the NHM London.

Project comments: This was one of the larger meteorites we found searching the Outer Recovery area, and one of the last we collected on our second field season.

Sample images and videos:

OUT 19131 sample in the field (note that this sample has a field collection number of #131 as it was the 14th stone collected). Image: Lost Meteorites of Antarctica / The University of Manchester
OUT 19131 sample in the lab after defrosting. Image: Lost Meteorites of Antarctica / The University of Manchester

OUT 19131 sample in the lab after defrosting. Image: Lost Meteorites of Antarctica / The University of Manchester
OUT 19131 sample in the lab after defrosting. Image: Lost Meteorites of Antarctica / The University of Manchester