Quartz bits

block survival:looseores-quartz-granite-free · from game

Where to find (natural deposits)

Read directly from the game's worldgen rules -- see Info for how this differs from an exact "X spawns at Y" guarantee. See also the full Deposits listing.

Category	Occurs in	Typical depth
mineralore	andesite, chalk, chert, conglomerate, limestone, claystone, granite, sandstone, shale, basalt, peridotite, phyllite, slate	shallow underground (relative height 0.5 -- Typical depth as a fraction of the world's height range: near 1.0 is close to the surface, near 0.0 is near the bottom of the world.)

Found in structures (2)

Structure	Kind
coalmine	storystructure
sunrift	storystructure

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.