|Just a Guess|
In the Plane-Hopper's Handbook there seem to be some alchemical reagents where the text states: "When you use a ... as a material component or focus for a spell " but they never go into detail when it is a material component and when a focus.
Could I buy 1 of each of those and use it as a focus each time I cast a spell where it applies?
Source Plane-Hopper's Handbook pg. 10
Price 300 gp; Weight —
This vibrant blue-green crystal is a distillation of the spirit of cooperation characteristic of the chaotic good plane of Elysium.
Doses 1 (300 gp); Spells harmless spells
Effect When you use a cooperation crystal as a material component or focus for a harmless spell, treat your caster level as 1 higher for the purpose of determining the spell’s duration and effect. This increase doesn’t stack with other effects that raise the caster level of a spell.