Tootfinder

Not surprising at all, but first time I'm seeing an example of reaction diffusion patterns in granite:
https://fed.brid.gy/r/https://bsky.app/profile/did:plc:gl3xultyaxwitlx5r5qmlxvq/post/3miqqqfvyzs27

Mineralogical Society of America (@mineralsocamerica.bsky.social)
American Mineralogist: Myrmekite and antiperthite formation in deformed granite: Chemical and crystallographic constraints on formation mechanisms Yueting Song, Thomas A. Griffiths, Shanrong Zhao, and Rainer Abart https://doi.org/10.2138/am-2024-9715