Magma is a common ore block found almost everywhere in the Nether.
Spawning[]
Magma spawns in chunks in the Nether, similar to how ores are found in the nether but has a higher spawn rate than your average Nether Quartz. They spawn in veins with up to 2-5 Magma, but sometimes generates much more spread out similar to how Emerald ore spawns in the mountain biomes.
Appearance[]
Magma appears to have orange dots that are similar to lava and have the animation as lava. What surrounds the dots is a texture of Netherrack. Unlike most ores, this block gives off light similarly to active Redstone ore.
Block Physics[]
Oddly, unlike most ores, it maintains its breaking speed no matter what is used to break it, meaning that it will not break faster using a pickaxe or any tool. When destroyed by hand or a tool, it spawns a Lava source block in its place similar to how Ice spawns a Water source block. If the block is broken on top of an air nothing is droped. It has a blast resistance of 2.5, comparable to dirt and netherrack. When explosions are applied to magma, it drops 0-1 Magma Crystals.
Obtaining Magma Crystals[]
The safest way to obtain Magma is to mine it with a silk touch pickaxe giving the player Magma, which they can place in a set area where explosions are safe.