Redstone Ore

Redstone ore is the ore block from which redstone is obtained. Deepslate redstone ore is a variant found in the deepslate layer of the world, below y=0.

Natural generation
Redstone ore can generate in the Overworld in the form of mineral veins. Redstone ore attempts to generate 8 times per chunk in veins of size 1-8, from altitudes 0 to 15, in all biomes.

Redstone ore is commonly found in caves with lava pools as well as some lapis lazuli ores. As of Java Edition 1.16.4, on average they generate 29.5 ores per chunk.

Breaking
Redstone ore can be mined with an iron pickaxe or higher, or it drops nothing. If mined with Silk Touch, the block drops itself. Otherwise, the block drops 4 or 5 redstone dust (or more with Fortune, averaging at 6 redstone dust with Fortune level 3 ).

Light
Redstone ore produces light (strength 9) and red particles when clicked, updated, or contacted by any mob (exception being a sneaking player). This effect continues until the redstone ore block receives a random block tick (averaging 68.27 seconds). This effect does not actually produce redstone power, but the block changes can be detected with an observer or a block update detector.

Subsequent clickings on a redstone ore block causes it to emit an extra burst of particles per click.

Note Blocks
Redstone ore can be placed under note blocks to produce "bass drum" sound.

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