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Glowstone Dust is a vanilla item dropped from Glowstone. It is used in many medium-to-high tier recipes in mods such as IndustrialCraft 2, such as the Advanced Circuit, the Quantum Leggings, and many others. It can be created in a Macerator if Glowstone is available to be macerated, or compressed in a Compressor or crafted if you don't have Gregtech to turn it back into a block of Glowstone. Glowstone dust may also be obtained from witch spawners. This can be quickly farmed through Soul Shards.
For more information, see this item's Minecraft Wiki page.