They can also be found east of the Teleport Waypoint in the Sea of Clouds. Some Starconch can also be found on the frigid coastlines of Dragonspine closer to Liyue. As of Version 1.4 it may also be bought from Bolai.
Starconch is not used in any recipes.
1 Characters use Starconch for ascension:
No Weapons use Starconch for ascension.