Nether Bricks

Nether Bricks is an upcoming block that will be added to the Nether. The bricks appear to be used to generate bridge-like structures. It can be seen in the second picture that there may be 2 different types of Netherrack Brick, one being a similar color to Netherrack and the other a darker shade of brown (more like Soul Sand)

Occurrence
Nether bricks make up the majority of the Nether Ruins structure, forming walls and supporting pillars.