This rock is weird. It contains fragments of the core and crust, but not its mantle. This is a peculiar combination of materials, which represent an entire group of meteorites, specifically being known as mesosiderites. Mesosiderites are different than pallasites, as the latter only contain portions of a minor planet's core and mantle. Today's video discusses one theory on how mesosiderites formed through the knowledge and analysis of a geologist. Thumbnail Photo Credit: This work "Mesosiderite10", is a derivative of a photo (resized, cropped, added white background to right & left sides of image, text overlay, added GeologyHub made graphics (the image border & the GeologyHub logo)) from "End Cut of the Enigmatic NWA 1878 Meso-B Meteorite", by: Steve Jurvetson, jurvetson, 2022, Posted on Flickr, Flickr account link: https://www.flickr.com/photos/jurvetson/, Photo link: https://www.flickr.com/photos/jurvetson/52041815290, CC BY 2.0. "Mesosiderite10" is used & licensed under CC BY 2.0 by Youtube.com/GeologyHub Video on the Missing Mantle Problem: https://www.youtube.com/watch?v=UjTd3_llaAk If you would like to support this channel, consider using one of the following links: (Patreon: http://patreon.com/geologyhub) (YouTube membership: https://www.youtube.com/channel/UCYeGh5VML5XPr5jYnzh3J6g/join) (Gemstone & Mineral Etsy store: http://prospectingarizona.etsy.com) (GeologyHub Merch Etsy store: http://geologyhub.etsy.com) Google Earth imagery used in this video: ©Google & Data Providers This video is protected under "fair use". If you see an image and/or video which is your own in this video, and/or think my discussion of a scientific paper (and/or discussion/mentioning of the data/information within a scientific paper) does not fall under the fair use doctrine, and wish for it to be censored or removed, contact me by email at [email protected] and I will make the necessary changes. Various licenses used in sections of this video (not the entire video, this video as a whole does not completely fall under one of these licenses) and/or in this video's thumbnail image (and this list does not include every license used in this video and/or thumbnail image): CC BY 2.0: https://creativecommons.org/licenses/by/2.0/legalcode CC BY-SA 2.0: https://creativecommons.org/licenses/by-sa/2.0/legalcode CC BY-SA 3.0: https://creativecommons.org/licenses/by-sa/3.0/legalcode CC BY 4.0: https://creativecommons.org/licenses/by/4.0/legalcode Sources/Citations: [1] Keisuke Sugiura, Makiko K. Haba, Hidenori Genda, Giant impact onto a Vesta-like asteroid and formation of mesosiderites through mixing of metallic core and surface crust, Icarus, Volume 379, 2022, 114949, ISSN 0019-1035, https://doi.org/10.1016/j.icarus.2022.114949. (https://www.sciencedirect.com/science/article/pii/S0019103522000690), CC BY 4.0. [2] Rubin, Alan E. "A history of the mesosiderite asteroid." American Scientist, vol. 85, no. 1, Jan.-Feb. 1997, pp. 26+. Gale Academic OneFile, link.gale.com/apps/doc/A19225242/AONE?u=azstatelibdev&sid=googleScholar&xid=210bb28c. Accessed 15 Sept. 2025. [3] Haba, M.K., Wotzlaw, JF., Lai, YJ. et al. Mesosiderite formation on asteroid 4 Vesta by a hit-and-run collision. Nat. Geosci. 12, 510–515 (2019). https://doi.org/10.1038/s41561-019-0377-8 0:00 A Strange Specimen 0:32 Mesosiderites 1:12 Mantle Xenoliths 2:21 Asteroid Impact 3:49 Vesta