Classification: Ordinary Chondrite H4
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 ‘H’ type – meaning it has high concentrations of iron (i.e. iron metal). The meteorite is also a type 4 sample – which means that it has been lightly 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 18005
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 blue ice surface. Altitude 1413 m.
Physical characteristics: Mass: 8.68 g. Pieces: 1. Dimensions: 3 × 3 × 1 cm. A round. whole stone with 100% black fusion crust.
Petrography: Some well-defined chondrules (up to 0.8 mm in diameter). chondrule fragments and mineral grains in coarse-grained matrix. Metal and sulfide grains up to 0.8 mm throughout. Plagioclase grains up to 0.2 mm.
Mineral compositions and geochemistry: All analyses by EPMA. Olivine Fa18.5±0.8 (N=12). Pyroxene Fs11.5±6.1.Wo1.0±0.4 (N=11). Plagioclase An13.7.Ab80.4.Or6.0 (N=1).
Specimens: 8.327 g type specimen (main mass) held at the NHM London.
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