Classification: Ordinary Chondrite L6
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 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 HUT 18026
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 hlaf buried in firn. Altitude 1116 m.
Physical characteristics: Mass: 6.29 g. Pieces: 1. Dimensions: 3 × 2 × 2 cm. An irregular, grey part stone with 30% black fusion crust.
Petrography: Equilibrated texture with poorly defined chondrules (up to 1 mm in diameter). Metal and sulfide distributed throughout.
Mineral compositions and geochemistry: Mineral compositions and geochemistry: All analyses by EPMA. Olivine Fa26.5±0.2 (N=10), Pyroxene Fs22.2±0.3Wo1.6±0.1 (N=12). Plagioclase An10.4±0.5Ab84.3±0.9Or 5.4±0.7 (N=3).
Specimens: 5.530 g type specimen (main mass) held at NHM.
Project comments: This sample is classified as an ordinary chondrite (L6). The silicate composition is at the limit between L and LL groups, but the magnetic susceptibility points of a metal content indicative of the L group Rochette et al. (2003).
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