mylonite

From Ancient Greek μυλών (mulṓn, “mill”) +‎ -ite.

• (UK) IPA^(key): /ˈmʌɪlənʌɪt/

mylonite (countable and uncountable, plural mylonites)

1. (geology) Any rock that has undergone modifications due to dynamic recrystallization following plastic flow; a schist created by crushed or ground rock.
   • 2004, Richard Fortey, The Earth, Folio Society 2011, page 87:

     Towards the end of the nineteenth century the crush rock known as mylonite had been recognised, a rocky paste that was ground when one mighty rock mass was pushed bodily – or thrust – over another.