Obsidian
Obsidian (Natural) is a Minecraft block with color #1A1426 / RGB 26, 20, 38. See it in the pixel art generator.
HEX
#1A1426
RGB
26, 20, 38
Palette group
Natural
How to get this block
Pour water over lava source blocks to form it, then mine with a diamond pickaxe (~9s per block). Required for nether portals.