Now up: a lecture, available online, about petrologic Type 1 meteorites and other astromaterials:
https://meteoritical.org/society/ed-scott-lecture-series
The series, as you might have guessed, are in tribute to Dr. Ed Scott, who died in 2021. Scott was a published and celebrated meteoriticist and cosmochemist, to the point that a mineral, edscottite, was named for him.
Thursday 18th December at 8 pm (UTC)
The abundance and importance of Type 1 material in the Solar System
Professor Sara Russell, Natural History Museum, London
“Brief overview: Type 1 chondrites are meteorites (and asteroids) that have experienced extensive aqueous alteration, so that the ratio of phyllosilicates to total silicates is ≥0.9. Such lithologies are rare in our meteorite collections but can be found in multiple other environments, including as xenoliths in other meteorites, micrometeorites, interplanetary dust particles and a meteorite recovered from the Moon (Bench Crater). Notably, two recent sample return missions, Hayabusa2 and OSIRIS-REx, recovered Type 1 material from asteroids Ryugu and Bennu. The talk will review the mineralogy, petrology and oxygen isotopes of known Type 1 lithologies. Type 1 material comprises a significant component of the modern extraterrestrial flux to the Earth and is likely common throughout the solar system. Their apparent rarity underlines the bias of our meteorite collections, since these samples are highly friable, challenging to identify, and they weather away quickly in a terrestrial environment.”
Give it a watch, it’s a very thorough talk.