Chlorophyte Ore is an ore found in the Underground Jungle in Hard Mode that spawns at any depth. It requires a pick or drill with at least 200% pickaxe power to mine. The earliest tools available to mine them are Drax and Pickaxe Axe, which are accessible after all 3 Mechanical Bosses have been defeated. Chlorophyte is one of the most important ores late game. It is used to craft the high-grade armors for Melee, Mage, and Ranger, namely Turtle Armor, Spectre Armor and Shroomite Armor respectively. It is highly recommended to use Spelunker Potions when in search for these ores, as it makes finding them much easier considering they blend in with the green jungle very well.
Chlorophyte Ore can actually grow, converting Mud blocks into more Chlorophyte Ore. This, however, only occurs at stone layer level or deeper, including the Underworld. The ores will not grow in a pre-Hard Mode world.
The ores won't "grow" if there are too many of them in one area. Within roughly every 100 ft, you may only have 25 blocks of the ore, then it will stop growing. Because of this, it is advised to not make the farm in the Underground Jungle, as there will be many ores hidden, preventing growth.
A good way to create a "farm" for Chlorophyte Ore is to create a 5x5 square of mud and putting one ore in the middle. Space the blocks at least 100 ft away from one another. Multiple blocks in one dense space will not yield more ores than a single block with sufficient spacing.
When on an online world, the ores may appear as though they are not growing. The block will appear as mud after spreading to another block, but after breaking the block, or reloading the world, it will appear as Chlorophyte Ore. So if the Chlorophyte Farm is at cavern level or lower, and suddenly seems to stop growing, try reloading the world or try the command, "settle" if TShock is currently in use.
A good way to keep Chlorophyte in your world, is to always leave one or two pieces behind for every chunk you gather. This way, you will not run short of it as the Chlorophyte will grow back shortly after.
The name Chlorophyte and the way the ore spreads may be a reference to the green algae type called Chlorophyta, or the green pigment in plants called chlorophyll.
The first part of the word, Chloro- comes from the greek word khlōrós, meaning green. The second part, -phyte comes from the greek word phutón, meaning plant. Therefore chlorophyte literally means 'a green plant'.
Online glitch before and after world reload
Efficient Chlorophyte Ore farm. A 5x5 Block every 100 ft down the hellevator