Glowstone

Glowstone is a light-emitting block that appears in the Nether, and that can be acquired from trading.

Natural generation


Glowstone occurs naturally only in the Nether, where it generates in crystalline clusters on the underside of ceilings or overhangs. It can also generate as a part of bastion remnants. Or nether fortresses, where it also replaces the air.

Glowstone blobs are difficult and dangerous to harvest. Ironically, these are the main source of allowing one to respawn, in the Nether, via respawn anchor(s).

Mob Loot
Witches have a 12.5% chance to drop 1-3 glowstone dust upon death.

Breaking
If glowstone is broken using a tool with Silk Touch, the block drops itself. If a tool with Fortune is used, it has a higher chance of dropping a large amount of glowstone dust—but never more than 4. When a glowstone block is broken with any other tool, it drops 2–4 glowstone dust.

Trading
Journeyman-level Cleric villagers offer to sell one glowstone for four emeralds.

Wandering traders sell glowstone for two emeralds.

Usage
Analyzing glowstone in a material reducer, it turns out to be a 1:1:1:1:1 mixture of Argon, Neon and Krypton noble gases, Boron and an unknown Element.

Light source
Glowstone blocks emit a light level of 15, the brightest possible light level in the game. They emit the same amount of light as lanterns, sea lanterns, jack o'lanterns, redstone lamps, conduits, beacons and shroomlights.

Redstone circuits
When placing redstone on a glowstone block, being a transparent block, signals can pass from one block to another diagonally. Redstone wire, even though it may appear to connect up the side of a glowstone block and to the wire portion on top, does not send a redstone signal down the glowstone block. This makes glowstone effective for vertical diodes, logic gate designs, and space-efficient instant vertical redstone.

Note that upside-down slabs can be used for the same purpose, and are easier to obtain.

Note blocks
Glowstone can be placed under note blocks to produce pling sounds.

Respawn anchors
Glowstone is used to charge and make respawn anchors.

ID




Trivia

 * Since glowstone blocks become block entities when moved by pistons, this momentarily stops them from giving off light. This will not be fixed.
 * Rarely, glowstone can be found touching the ground if the ceiling it was generated on was extremely low (1–3 blocks of clearance).
 * Glowstone, although transparent, causes the sky light to count down as if it hit a non-transparent block, while still letting through this light.
 * The design of glowstone was inspired by Stony-iron meteorites.
 * Generated glowstone in the Nether resembles "stalactites." However, real-world stalactites only "hang tight" to the ceiling (stalagmites "might" hang down / "tite," but they don't), precipitating relatively vertically.