Coal Ore

Natural Generation
Coal ore can generate in the Overworld in the form of mineral veins. Coal ore attempts to generate 20 times per chunk in veins of size 0-37, from levels 0 to 127, in all biomes. An average of 207 coal ore generates per chunk. Coal ore can replace stone, granite, diorite, and andesite. ‌In Java Edition, it can also replace tuff and deepslate, though it does not naturally occur in the same ranges as these blocks.

Breaking
Coal ore must be mined with any pickaxe, or else it drops nothing. If mined with a pickaxe, coal ore drops 1 coal (or more with Fortune). If mined with Silk Touch, the block drops itself instead.

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

Issues
Issues relating to "Coal Ore" are maintained on the bug tracker. Report issues there.