The Tourmaline Glass is a non-transparent pink and a little green building-block that glows brightly in the dark. It can be crafted in your Crafting Menu (default key "Q") or at Crafting Tables (that still exist in worlds created before R22 on September 16th 2015), but only after the crafting-recipe has been unlocked upon taking/mining Tourmaline from the Stalactite layer with at least a Stone Mining Cell or from the Lava layer with at least an Obsidian Mining Cell equipped - or by looting / harvesting it from Warmworms.