The Tundra is a relatively flat, cold biome. It was created to resemble the tundra of Siberia and northern North America, an inhospitable place just like the Minecraft biome. The surface is covered by green-brown grass. The ground is covered only by red colored bushes and cobblestone boulders (similar to the ones found in vanilla Mega taiga biomes, but without moss).
Survival is tough here, with the only wood coming from the single oak log in every bush, and no actual trees present. Passive mobs do not spawn in this biome. Villages spawn in this biome.
Since the Tundra is classed as a cold biome, Tanzanite occurs within this biome.