Silicon

This intermediate connects crafting to both defense and progression, so shortages can stop more than one kind of project.

When it fits: Consolidate silicon demand before splitting stock between an advanced turret and a unit/reconstructor route.

The tradeoff: One source recipe run makes 8 and lists 6 Sand, 4 Coal, 1 Pyratite at Silicon Crucible; 2 recipe variant(s) for this output are grouped together. Verify access where the pack is incomplete. The smelting line must keep up with every active consumer; a material total is not a continuous supply guarantee.