Sutured contacts

Usually refers to quartz grains, which have undergone partial recrystallisation, producing irregular, sutured grain boundaries.

Have a look at the quartzites (L520, L521) in the 1A Reference Series.

“Sutured contacts,” 1A Collections, accessed April 9, 2024, https://wserv3.esc.cam.ac.uk/p1acollections/items/show/257.