Classification: Ordinary Chondrite L5
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 ‘L’ type – meaning it has low concentrations of iron (i.e. iron metal). The meteorite is also a type 5 sample – which means that it has been moderately 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 HUT 18022
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 first field season in austral summer December 2018 – January 2019 by a two person field party consisting of Katherine Joy and Julie Baum. Found on rock surface on top of Turner Nunatak, which is located to the north of the Hutchison Icefield. Altitude ~1194 m.
Physical characteristics: Mass: 82.94 g. Pieces: 1. Dimensions: 7 cm x 5 cm x 4 cm. An irregular, part stone with 50% black fusion crust and light grey interior.
Petrography: Abundant well-defined chondrules (up to 1.7 mm in diameter) and coarse-grained matrix. Metal and sulfide throughout, some rimming chondrules.
Mineral compositions and geochemistry: All analyses by EPMA. Olivine Fa 23.9±0.3 (N=14), Pyroxene Fs 20.2±0.4 (N=9), Wo 1.2±0.2 (N=9).
Specimens: 18.31 g type specimen (main mass) held at the NHM London.
Project comments: This was a very neat find, discovered during a serendipitous search of the surface of an unnamed (now called Turner, after Prof Grenville Turner) nunatak. The team hadn’t manage to locate any samples on ice surfaces that day, so this find was an unexpected reward.
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