Chlorophyte Bar

Chlorophyte Bars are crafted from 6 Chlorophyte Ore, an end-game Hardmode ore which can be found in the Underground Jungle, or grown in mud. To make Chlorophyte Bars, you need a Titanium or Adamantite Forge depending on which Hardmode metal you got.

Crafting all Chlorophyte equipment, excluding the arrows, bullets, Spectre equipment and Shroomite Bars, requires 288 Chlorophyte Bars, or a total of 1,728 Chlorophyte Ore.

To craft one set of each (including helmet/body variants) Chlorophyte armor, Spectre armor, Turtle armor, Beetle armor and Shroomite armor, you'd need a total of 354 Chlorophyte Bars plus the various other materials, which equals 2,124 Chlorophyte Ore.

Trivia
Chlorophyte is a reference to chlorophyll in chloroplasts in plant cells.

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