This tab will tell you about all the naturally spawning blocks! First off, crystal. Crystal blocks lit up a small area, and when you break them, you get 1-4 shards. 4 Shards make 1 Crystal Block! Crystal blocks spawn in groups of up to 4, an spawn in and below 30 Y. Dark Metal spawns in and below 24 Y in groups of up to 8 , and drops itself, but needs to be smelted for ingots. Then there is basalt, marble, gneiss, shale, and limestone. These all spawn in and below 50 Y, and have around 16 in a group. Visit the Rocks page for more info on these.