What is another word for "induration"?

Roget's Thesaurus (1911) lists these synonyms for "induration": adamant, adamantean, adamantine, and, benefit, block, board, bone, bony, brick, buckram, calculous, callosity, cartilage, cartilaginous, cast, cement, clergy, concrete, conscience, contrition, corneous, crag, crystal, crystallization, deal, die, durity, firm, flint, fossil, game, graceless, granite, granitic, gritty, hard, harden, hardened, hardness.