Iolite ★★★

Nothing in this list is craftable in turn, so one Iolite is a single step: 2 units of material drawn from 2 base items, plus 3 crystals.

That bill outweighs 3,130 of the 13,602 recipes tracked here and 416 of the 2,216 Goldsmith ones, and 9,374 recipes nest deeper.

1 of the 2 raw materials come out of the ground, and one of them is time-gated: Raw Iolite (3:00). That window comes round once per Eorzean day, every 70 real-world minutes.

Iolite is itself consumed by 20 further recipes, spanning four of the eight crafting classes.