3-in-1 Chlorophyte/Crystal Shard/Glowing Mushroom Farm (perfect for endgame Rangers)

[Veyhedis]

This is a well effective guide I saw for farming those materials. Keeping the ore and using 4 blocks into those shapes is pretty good, giving most blocks a chance to be converted without the need to wait the adjacent ones to be transformed before. A noticeable change I made was removing the mushrooms to put a line of crimstone and ebonstone with a lever to change the spawn surface. This allows me to farm cursed flames and ichor along with the chlorophyte and crystal shards :

(for the design and the pearlstone blocks placement, I was too lazy so I just simplified it and used lines of pearlstone)

 

[Oofeee]

Sick bro

 

[putianyi888]

every pearlstone/hallow ice block has the chance to get a crystal at left, right or bottom (if free). With current code (bug) bottom has 50% chance, left and right 25% chance each.
A crystal spawns if in the region +/- 6 blocks around the location not more than 1 crystals already exists.

Still true in 1.3.5.2