Zhuni what? zisha who?
I recently came across a teapot, about 260ml, makes a rather dull sound when tapped, distinctly mutes many a tea, takes much of the harshness out of young shengs and assamic blacks, absorbs surrounding odors like a black hole, clay seems to be getting very slightly more purplish with more use (though it is a very subtle purple only noticeable under certain lighting
A little drippy at the spout, lid is not fit perfect, but pot is very functional, 3 stamps, bottom of lid, bottom of pot, and underside of a branch that is part of the handle.
From this description what kind of clay does this sound like to you?