Chert gravel

block game:gravel-chert · from betterruins

Used in (2)

Filters

Recipe	Category	Ingredients → output
Dry dirty gravel (Plain) (Item Recipe)	grid	Chert gravel + soil-chert-none → Dry dirty gravel (Plain) ×2
muddygravel	barrel	Water ×1L + Chert gravel → Muddy gravel

Found in structures (4)

Structure	Kind
coalmine	storystructure
university	storystructure
megastructures-mountaincastle-ogdred-o10	structure
surfaceunderground-dampuscave-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.