Stone Cutting using Any of Obsidian / Polished Obsidian. Produces Polished Obsidian Slab.
Stone Cutting 
Polished Obsidian Slab guaranteedRecipes using Polished Obsidian (6)
Stone Cutting Polished Obsidian Slab guaranteedCrafting using Polished Obsidian, Polished Obsidian and Polished Obsidian, arranged in the pattern shown. Produces 6× Polished Obsidian Slab.
Crafting 
Polished Obsidian Slab ×6 guaranteedCrafting using Polished Obsidian, Polished Obsidian, Polished Obsidian, Polished Obsidian, Polished Obsidian and Polished Obsidian, arranged in the pattern shown. Produces 4× Polished Obsidian Stairs.
Crafting 
Polished Obsidian Stairs ×4 guaranteedStone Cutting using Any of Obsidian / Polished Obsidian. Produces Polished Obsidian Wall.
Stone Cutting 
Polished Obsidian Wall guaranteedStone Cutting using Any of Obsidian / Polished Obsidian. Produces Polished Obsidian Stairs.
Stone Cutting Polished Obsidian Stairs guaranteedCrafting using Polished Obsidian, Polished Obsidian, Polished Obsidian, Polished Obsidian, Polished Obsidian and Polished Obsidian, arranged in the pattern shown. Produces 6× Polished Obsidian Wall.
Crafting Polished Obsidian Wall ×6 guaranteed