巣 - The Su in Su-ita

The eponymous Su are a common calling card in the Jnats we refer to as Suita. They’re the little tiny holes in the stone that can, at times, resemble an insect’s nest or hive.  The term Suita is usually translated as ‘Nest Plate’, where Su means ‘nest’.  

Trapped gas bubbles formed these tiny craters when the prolith at the bottom of the ocean was undergoing lithification. During this period of porosity destruction, gases emerging from the semi-fluid prolith sediment were attempting to bubble up to the surface. As the mud solidified, some of the bubbles were captured in the newly formed sedimentary layers of shale. 

In use, I find Su to be, essentially, innocuous. I’ve honed many razors on all types of Suita using all types of Nagura without one single issue of any kind. 

Suita without Su are referred to as Sunashi.

Stones that are not from Suita layers that have Su are not Suita. 


© Keith V Johnson 2014 - 2018