Fire clay

item game:clay-fire · from betterruins

Can be formed into basic pottery items. shift + rightmouse click on the ground to begin clay forming.

Used in (2)

Filters

Recipe	Category	Ingredients → output
Red ceramic tile (circle pattern) (Item Recipe)	grid	Fired red ceramic shingle ×2 + chisel-* + hammer-* + Artisan's Blueprint + Fire clay → Red ceramic tile (circle pattern) ×4
PlugAndFeather Mold	clayforming	Fire clay → Raw fire clay splitter plug mold

Found in structures (3)

Structure	Kind
largeforlornhopetower	storystructure
megastructures-forlornhopetower-common-niclass	structure
megastructures-giantcathedral-dampus	structure

This confirms the schematic(s) contain this code somewhere, not where or how many times -- the per-instance block-entity decoding used for tapestries isn't run for every content type.