Citadel/Reference/Material5Material typeA block's material as five yes-or-no questions, from block.material: solid, covers, firm, liquid and burns.Fields 5material.solid: booleanWhether the jar's Material counts as solid.material.covers: booleanGrass under it dies.material.firm: booleanSnow and ice need it beneath them.material.liquid: booleanWhether the jar's Material is a liquid.material.burns: booleanWhether the jar's Material burns.