So yes the psilocybin ones oxide into psilocin. These blue ones and its relative 
stumped silly old AI on why they are that colour. So I was thinking they must be blue where the light hits them for a reason as the gills are white and apparently they can change colour.
Then I found this:
Which suggests: Chlorociboriachlorin: Produces brighter greens and turquoise blues
You get chlorins in chloroplasts aka the bit that photosynthesises in plants too so it seems to fit. The colour comes from magnesium which is the element base for photosynthesis in the same way iron is the base for people's blood.
Stropharia aeruginosa - Wikipedia
THEKITCHENTODAY
An Overview of Green Mushrooms: Types, Identification, Edibility, and More
Stropharia aeruginosa Stropharia aeruginosa, commonly known as the blue-green stropharia, or verdigris agaric, is a medium-sized green, slimy woodl...
Chlorin - Wikipedia
