Ore

Some ores require smelting to get their items. Some ores drop the material straight when you mine it like diamond ore or redstone ore. Ores are essential to mining, also to get some achievements like "The end" or "DIAMONDS" and are mainly used to make tools when you have iron or diamond. Some can be used to make blocks like lapis lazuli block or, just to make some creations in survival like a redstone elevator with obviously, redstone.

Ores can only be found near stone. If it's not near stone than you must of cleared the surroundings of the ore. Ores can also be found above sea level that had a clear ground with no grass or sand near. It uncommonly happens in jungles.