Soul Snow (left) & Thick Soul Snow (right)
Soul Snow is a block added by the Soul Forest Mod. Is almost identical to the Thick Soul Snow, but has a very clear difference: you can walk and fall through the block. As you can't look through the block it i very difficult to see which are the Soul Snow blocks and which are the Thick Soul Snow blocks.
Crafting[]
Soul Snow can be used to craft Ice Bricks, together with Thick Soul Snow, Frozen Rods and Frost Shards.
Biomes[]
Soul Snow only spawns in the Frost Caves Biome in the Soul Forest Dimension, which makes that biome a very dangerous biome. You might just fall down a long way as theres suddenly a very little ground underneath the Soul Snow Blocks. Soul Snow is the 1e layer of blocks on a platform from haflway up the dimension and only appears to spawn halfway up the dimension.