In literature, “indurate” is employed both as a literal descriptor of physical hardness and as a metaphor for emotional rigidity. Authors use it to detail substances that become solid or weathered, as when deposits in a cavern “harden” into spar-like formations [1] or ores lie beneath “indurate ledges” [2]. At the same time, the term vividly conveys a character’s intransigence or callousness, as seen in portrayals of Pharaoh’s hardened heart [3, 4] or the self-described “indurate heart” that resists persuasion or divine truth [5, 6]. Such usage underscores a dual quality: it captures not only the tangible durability of materials [7, 8] but also the obstinate and unyielding nature of human emotions and resolve [9, 10].