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INTRODUCTION NASA's OSIRIS-REx mission launched in 2016 to visit carbonaceous asteroid (101955) Bennu (Lauretta et al., 2017). The asteroid was found to be a rubble pile, consisting of reaccumulated debris from a larger parent asteroid that accreted early in solar system history and was later disrupted catastrophically by a collision (e.g., Barnouin et al., 2019; Walsh et al., 2019).
Abstract Samples of asteroid (101955) Bennu delivered by the OSIRIS-REx mission offer the opportunity to study pristine planetary materials unchanged by exposure to the terrestrial environment. Here we use a combination of X-ray diffraction and various electron microscopy techniques to explore the detailed mineralogy of Bennu samples and determine the alteration history of the planetesimal protolith from which they originated.
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